I: Refers to yourself. I am happy.

Ice: Frozen water. The ice is cold.

Iceberg: A big piece of ice in the sea. The ship saw an iceberg.

Icicle: A thin piece of hanging ice. Icicles hung from the roof.

Icing: Sweet cream on cake. The icing is pink.

Icon: A small picture symbol. Click the icon on screen.

Idea: A thought or plan. I have a good idea.

Ideal: Perfect or best. This is an ideal day.

Identify: To know who or what something is. Can you identify the bird?

Idle: Not busy. He sat idle all day.

If: Used to talk about something possible. If it rains, we stay home.

Ignore: To not pay attention. Do not ignore your teacher.

Ill: Sick or unwell. She feels ill today.

Illegal: Against the law. Stealing is illegal.

Illness: Being sick. He stayed home due to illness.

Image: A picture. I saw her image in water.

Imagine: To think of something in your mind. Imagine a big castle.

Imitate: To copy someone. He can imitate his dad.

Immediate: Happening right now. I need immediate help.

Immense: Very big. The ocean is immense.

Immune: Protected from sickness. Vaccines make us immune.

Impact: A strong hit or effect. The impact was loud.

Impatient: Not wanting to wait. He is impatient in line.

Important: Very special or needed. Water is important.

Impossible: Cannot happen. Flying without wings is impossible.

Impress: To make someone admire you. She will impress the class.

Improve: To make better. Practice helps you improve.

In: Inside something. The cat is in the box.

Inch: A small measure of length. The bug is one inch long.

Include: To have something as a part. Please include your name.

Income: Money you earn. His income helps the family.

Increase: To grow more. The price may increase.

Indeed: Truly or really. She is indeed kind.

Indigo: A dark blue color. Her dress is indigo.

Indoor: Inside a building. We played indoor games.

Industry: Work of making goods. The car industry is big.

Infant: A very young baby. The infant slept well.

Infect: To spread germs. Germs can infect people.

Infection: Illness from germs. He has an infection.

Inflate: To fill with air. Inflate the balloon.

Influence: To affect someone. Friends influence us.

Inform: To tell news. Inform me later.

Information: Facts or details. I need information.

Ingredient: Part of food recipe. Sugar is an ingredient.

Inhale: To breathe in. Inhale fresh air.

Inherit: To get from family. She will inherit the house.

Initial: First letter of name. My initial is K.

Injure: To hurt. Do not injure animals.

Injury: A wound or hurt. He had a leg injury.

Ink: Colored liquid for writing. The pen has blue ink.

Insect: A small bug. The insect crawled.

Inside: Inner part. Stay inside the room.

Insist: To say firmly. I insist on helping.

Inspect: To check carefully. Inspect your homework.

Inspire: To encourage. Teachers inspire students.

Install: To fix in place. Install the fan.

Instant: Happening quickly. It was instant noodles.

Instead: In place of something else. Drink juice instead of soda.

Instrument: A musical tool. She plays an instrument.

Insure: To protect with a policy. We insure our car.

Intelligent: Smart. She is intelligent.

Intend: To plan. I intend to study.

Interest: Want to know more. I have interest in art.

Interesting: Fun to learn. The book is interesting.

Internet: Online network. I use the internet.

Interrupt: To stop someone speaking. Do not interrupt.

Into: Going inside. Jump into the pool.

Introduce: To present someone new. Introduce your friend.

Invent: To create something new. He will invent a toy.

Invite: To ask someone to come. Invite her to the party.

Involve: To include. The game involves running.

Iron: Strong metal. The gate is iron.

Island: Land with water around. We visited an island.

It: Refers to a thing. It is raining.

Itch: A tickling feeling. I have an itch.

Item: A single thing. Buy one item.

Ivory: Creamy white color. The keys are ivory.

Icebox: A cold storage box. Put milk in the icebox.

Icecap: Ice on mountain top. The icecap is melting.

Icecream: Frozen sweet food. I love icecream.

Icy: Very cold. The road is icy.

Idealist: A person who believes in big dreams. He is an idealist.

Identity: Who someone is. Show your identity card.

Idol: A hero person. She is my idol.

Ignite: To start fire. Ignite the candle.

Ignorant: Not knowing. He is ignorant of rules.

Illiterate: Cannot read or write. Help illiterate people.

Illustrate: To draw pictures. Illustrate the story.

Illustration: A drawing in a book. The book has an illustration.

Imaginary: Not real. The dragon is imaginary.

Imitation: Copy of something. This is imitation gold.

Immigrate: Move to another country. They immigrate for work.

Immigrant: Person moving to a new country. The immigrant works hard.

Immoral: Not right. Cheating is immoral.

Impolite: Not polite. Do not be impolite.

Import: To bring from another country. India imports oil.

Importance: Being important. Health has great importance.

Impose: To force a rule. Do not impose rules unfairly.

Icehouse: A building for storing ice. The icehouse kept food cold.

Icepack: A bag with ice for injuries. The doctor used an icepack.

Iciness: Extreme cold feeling. The iciness hurt my fingers.

Iceland: A cold country. Iceland has many glaciers.

Icing sugar: Powdered sugar for desserts. She sprinkled icing sugar.

Iconic: Very famous symbol. The Taj Mahal is iconic.

Iconography: Study of symbols. The book explains iconography.

Icy wind: Very cold wind. The icy wind blew hard.

Idealism: Belief in perfect ideas. Her idealism inspires others.

Ideally: In a perfect way. Ideally we finish early.

Ideate: To create ideas. The team will ideate solutions.

Identification: Proof of identity. Show your identification card.

Identifier: Something that shows who you are. The badge is an identifier.

Identity card: Official ID document. Carry your identity card.

Ideology: A system of ideas. The leader explained his ideology.

Idiom: A special phrase meaning something different. “Break a leg” is an idiom.

Igloo: A house made of ice. Eskimos build igloos.

Ill-tempered: Easily angry. The man is ill-tempered.

Illogical: Not making sense. His answer was illogical.

Illusion: Something that tricks the eyes. The magician made an illusion.

Illustrator: A person who draws pictures for books. The illustrator drew cartoons.

Imagery: Pictures formed in the mind. The poem has strong imagery.

Imaginative: Full of creative ideas. She is very imaginative.

Imbalance: Lack of balance. Poor diet causes imbalance.

Imbibe: To absorb ideas or knowledge. Students imbibe knowledge.

Immaculate: Perfectly clean. The room was immaculate.

Immaterial: Not important. The mistake is immaterial.

Immediately: At once. Come here immediately.

Immensity: Great size. The immensity of the ocean amazed us.

Immigration: Moving to another country. Immigration rules are strict.

Imminent: About to happen. Rain is imminent.

Immorality: Lack of morals. Society rejects immorality.

Immortality: Living forever in stories. Myths speak of immortality.

Immovable: Cannot move. The rock is immovable.

Impactful: Having strong effect. Her speech was impactful.

Impair: To damage. Smoking can impair health.

Impartial: Fair and equal. The judge stayed impartial.

Impatiently: In a hurry. He waited impatiently.

Impede: To slow down. Traffic can impede travel.

Imperial: Related to an empire. The imperial palace is huge.

Imperfect: Not perfect. The drawing is imperfect.

Imperfection: A small mistake. Everyone has imperfection.

Impersonal: Without feelings. The message felt impersonal.

Impersonate: Pretend to be someone. He can impersonate actors.

Impetus: Force that starts action. The project gained impetus.

Impish: Playfully naughty. The child had an impish smile.

Implant: Put into the body. Doctors implant devices.

Implement: To carry out a plan. Schools implement rules.

Implementation: Carrying out action. Policy implementation began.

Implication: Possible result. The news had big implication.

Implicit: Understood but not said. There was implicit trust.

Implore: Beg strongly. I implore you to listen.

Imply: Suggest without saying. His words imply anger.

Impoliteness: Rude behavior. Impoliteness is disliked.

Importer: Person who brings goods from another country. The importer bought machines.

Imposing: Grand and impressive. The building is imposing.

Impostor: Fake person pretending to be someone else. The impostor fooled people.

Impoverish: Make poor. War can impoverish nations.

Impractical: Not useful. The idea seems impractical.

Impression: Opinion about something. My impression is good.

Impressive: Making admiration. The speech was impressive.

Imprint: Mark left behind. The shoe left an imprint.

Imprison: Put in jail. Criminals are imprisoned by law.

Improper: Not correct. That behavior is improper.

Improperly: In the wrong way. He acted improperly.

Improvement: Becoming better. Practice leads to improvement.

Improvise: Create quickly without planning. She can improvise songs.

Impulsive: Acting suddenly. He made an impulsive decision.

Impurity: Something not pure. The water had impurity.

Inability: Lack of ability. His inability slowed the work.

Inaccurate: Not correct. The report is inaccurate.

Inaction: Doing nothing. Inaction caused failure.

Inactive: Not active. The volcano is inactive.

Inadequate: Not enough. The food was inadequate.

Inanimate: Not living. A rock is inanimate.

Inappropriate: Not suitable. The joke was inappropriate.

Inborn: Natural from birth. Talent may be inborn.

Inbuilt: Built inside. The phone has an inbuilt camera.

Incapable: Not able to do something. He is incapable of lying.

Incense: Fragrant smoke. Incense smells nice.

Incentive: Reward for work. The company gave an incentive.

Inchworm: A small caterpillar. The inchworm moved slowly.

Incident: A small event. The incident surprised us.

Incidentally: By chance. Incidentally I met her.

Incline: A slope. The road has an incline.

Inclined: Likely to do something. I am inclined to agree.

Inclusive: Including everything. The plan is inclusive.

Incoming: Coming in. The phone shows an incoming call.

Inconvenience: Trouble caused. Sorry for the inconvenience.

Incorporate: Include as a part. Incorporate new ideas.

Incorrect: Not correct. Your answer is incorrect.

Increasingly: More and more. It is increasingly popular.

Incredible: Hard to believe. The view is incredible.

Indebted: Owing thanks or money. I feel indebted to you.

Indecent: Not proper. The joke was indecent.

Indefinite: Not fixed. The date is indefinite.

Independence: Freedom from control. India celebrates independence.

Independent: Free from control. She is independent.

Index: List of topics in a book. Check the index.

Indian: Person from India. He is Indian.

Indicate: Show or point out. Signs indicate danger.

Indicator: Something that shows. The light is an indicator.

Indifference: Lack of care. His indifference hurt friends.

Indifferent: Not caring. He looked indifferent.

Indignant: Angry at unfairness. She felt indignant.

Indirect: Not direct. He gave an indirect answer.

Indispensable: Very necessary. Water is indispensable.

Individual: A single person. Each individual matters.

Induce: Cause something to happen. Stress can induce headache.

Indulge: Allow pleasure. Do not indulge laziness.

Industrial: Related to factories. Industrial growth rises.

Industrialist: Owner of industries. The industrialist built factories.

Inefficient: Not effective. The system is inefficient.

Inevitable: Certain to happen. Change is inevitable.

Infancy: Early baby stage. He died in infancy.

Infectious: Able to spread disease. Flu is infectious.

Infer: To conclude from facts. We infer the meaning.

Inferior: Lower quality. This cloth is inferior.

Infinite: Without end. Numbers are infinite.

Infinity: Endless state. The sky feels like infinity.

Inflammable: Easy to burn. Petrol is inflammable.

Inflammation: Swelling in the body. Infection causes inflammation.

Inflation: Rise in prices. Inflation affects people.

Influential: Having power to influence. She is influential.

Informal: Casual style. We had an informal meeting.

Informative: Giving knowledge. The book is informative.

Infrared: Invisible light wave. Cameras use infrared.

Infrastructure: Basic facilities like roads and bridges. Roads are infrastructure.

Ingenuity: Clever creativity. His invention shows ingenuity.

Inhabit: Live in a place. Birds inhabit forests.

Inhabitant: Person living there. City inhabitants increased.

Inheritance: Property from family. She got an inheritance.

Inhibit: Stop something. Fear may inhibit action.

Initiate: Start something. Leaders initiate change.

Initiative: Ability to start work. She shows initiative.

Inject: Put medicine in the body. Nurse injects vaccine.

Injection: Medicine shot. The injection hurt a little.

Injustice: Lack of fairness. People protest injustice.

Inkpot: Small pot for ink. The writer used an inkpot.

Inn: Small hotel. Travelers stayed in the inn.

Inner: Inside part. Listen to your inner voice.

Innocence: Being pure. Children have innocence.

Innocent: Not guilty. The man is innocent.

Innovate: Create new ideas. Companies innovate technology.

Innovation: New invention. Smartphones show innovation.

Innovative: Having new ideas. She is innovative.

Input: Information given. The teacher asked for input.

Inquiry: Asking questions. Police made an inquiry.

Inquisitive: Curious to know. The child is inquisitive.

Insane: Mentally unstable. The villain acted insane.

Inscription: Writing on stone. The temple had an inscription.

Insecure: Not confident. He felt insecure.

Insert: Put inside. Insert the card in the machine.

Insight: Deep understanding. Her insight solved the problem.

Insomnia: Trouble sleeping. Stress causes insomnia.

Inspection: Careful checking. The inspector did an inspection.

Inspector: Officer who checks. The inspector visited school.

Inspiration: Motivation or idea. Nature gives inspiration.

Inspirational: Giving motivation. Her story is inspirational.

Instability: Lack of stability. Political instability grows.

Installment: Payment in parts. Pay in installments.

Instance: Example case. This is an instance of kindness.

Instantly: At once. Lights turned on instantly.

Instinct: Natural behavior. Birds fly by instinct.

Institution: Organization for a purpose. A school is an institution.

Instruction: Direction to follow. Follow the instructions carefully.

Instructor: Teacher or trainer. The instructor taught driving.

Instrumental: Helpful in result. She was instrumental in success.

Insufficient: Not enough. Money was insufficient.

Insult: Hurtful words. Do not insult others.

Insurance: Protection plan. Health insurance helps families.

Insured: Covered by insurance. The car is insured.

Intact: Not damaged. The vase stayed intact.

Integral: Important part. Honesty is an integral value.

Intellect: Power of thinking. His intellect is sharp.

Intellectual: Related to thinking. The debate was intellectual.

Intelligence: Ability to learn. Dogs show intelligence.

Intensify: Make stronger. Rain may intensify tonight.

Intensity: Strength of feeling. The intensity shocked us.

Intent: Purpose or aim. His intent was clear.

Intention: Plan to do something. My intention is good.

Interactive: Two-way action. The class is interactive.

Interconnect: Link together. Computers interconnect networks.

Interior: Inside area. The interior looks nice.

Intermediate: Middle level. She passed the intermediate exam.

Internal: Inside something. Internal parts are hidden.

International: Between countries. International trade grows.

Interpret: Explain meaning. Interpret the poem.

Interpretation: Explanation of meaning. His interpretation was smart.

Interruption: Break in action. Power interruption happened.

Intersection: Place where roads cross. Wait at the intersection.

Interval: Short break time. There is an interval in the movie.

Interview: Formal meeting for a job. She had an interview.

Intimate: Close relationship. They are intimate friends.

Intimidate: Make someone afraid. Bullies intimidate others.

Introduction: Beginning speech. The teacher gave an introduction.

Inventor: Person who invents. Edison was an inventor.

Inventory: List of goods. The shop checked its inventory.

Invest: Put money in business. People invest savings.

Investment: Money put for profit. Gold is an investment.

Invisible: Cannot be seen. Air is invisible.

Invitation: Request to come. I received an invitation.

Invitee: Person invited. The invitee arrived early.

Invoice: Bill for payment. The shop sent an invoice.

Iodine: Chemical element. Salt contains iodine.

Ionic: Related to ions. Chemistry studies ionic bonds.

Iota: Very tiny amount. Not one iota changed.

Irate: Very angry. The man was irate.

Iridium: A rare metal. Iridium is strong.

Iris: Colored part of the eye. Her iris is blue.

Irony: Opposite meaning humor. The story shows irony.

Irregular: Not even pattern. The shape is irregular.

Irrelevant: Not related. That point is irrelevant.

Irreplaceable: Cannot be replaced. Family is irreplaceable.

Irrigate: Supply water to land. Farmers irrigate crops.

Irrigation: Watering crops. Irrigation helps farming.

Irritate: Annoy someone. Loud noise irritates me.

Irritation: Annoying feeling. Dust caused irritation.

Isolate: Keep separate. Doctors isolate patients.

Isolation: Being alone. The island faced isolation.

Issue: Important topic. Climate change is an issue.

Itemize: List each item. Itemize expenses clearly.

Ivory tower: Place of study or thinking. Scholars stay in an ivory tower.

Ivory white: Pale white color. Her dress is ivory white.

Ibis – a long-legged bird. The ibis stood near the water.

Iceberg – a large piece of ice floating in the sea. The ship passed an iceberg.

Icebox – a box used to keep food cold. Milk stayed fresh in the icebox.

Icebreaker – a ship that moves through ice. The icebreaker cleared the path.

Icecap – thick ice covering a mountain. The mountain had a white icecap.

Icelandic – related to Iceland. She read an Icelandic story.

Iconic – very famous or well known. The statue is an iconic landmark.

Ideaful – full of ideas. The ideaful child solved the puzzle.

Idealism – belief in high values. Her idealism inspired others.

Ideality – the state of being perfect. The design had great ideality.

Ideate – to form ideas. Students ideate new projects.

Identicalness – being exactly the same. The twins had identicalness.

Identification – proof of who someone is. He showed identification.

Identifier – something that shows identity. The badge was an identifier.

Identity – who a person is. Your name is part of your identity.

Ideogram – a symbol representing an idea. Some languages use ideograms.

Ideology – a system of ideas. The book explained the ideology.

Idler – a person who does nothing. The idler sat in the shade.

Idolize – to admire greatly. Many fans idolize the singer.

Idyllic – very peaceful and pretty. The village looked idyllic.

Ignite – to start burning. Sparks can ignite dry leaves.

Ignition – the act of starting a fire or engine. He turned the ignition.

Ignoble – not honorable. The ignoble act upset everyone.

Ignorant – lacking knowledge. The student was ignorant of the fact.

Illumine – to light up. Lamps illumine the road.

Illumination – bright lighting. The hall had beautiful illumination.

Illustrator – a person who draws pictures for books. The illustrator made fun drawings.

Illusionist – a magician. The illusionist amazed the crowd.

Illustrative – explaining with examples. The teacher gave illustrative stories.

Imaginary – existing only in the mind. The dragon was imaginary.

Imagination – the ability to create ideas in the mind. Her imagination was strong.

Imaginative – full of creative ideas. The child told an imaginative story.

Imbalance – lack of balance. Too much work causes imbalance.

Imitate – to copy someone. The boy tried to imitate his teacher.

Imitation – a copy of something. The toy was an imitation.

Imitator – someone who copies others. The imitator made funny voices.

Immature – not fully grown or developed. The puppy was immature.

Immediacy – the quality of being immediate. The message had urgency and immediacy.

Immense – very big. The elephant is immense.

Immensity – great size. The ocean shows immensity.

Immigrant – a person who moves to another country. The immigrant started a new life.

Immigrate – to move to another country. They plan to immigrate soon.

Immigration – the act of entering a country to live. Immigration rules help control entry.

Immoral – not right or good. Lying is immoral.

Immovable – unable to move. The rock was immovable.

Impactful – having strong effect. Her speech was impactful.

Impartial – fair and not taking sides. The judge was impartial.

Impatience – inability to wait calmly. His impatience showed.

Impatient – not willing to wait. She became impatient in line.

Impeccable – perfect and without mistakes. His manners were impeccable.

Impel – to push forward. Curiosity will impel you to learn.

Imperial – related to an empire. The palace had imperial style.

Imperfect – not perfect. The drawing was imperfect.

Imperfection – a small flaw. The vase had a tiny imperfection.

Impersonate – pretend to be someone else. He tried to impersonate a teacher.

Impersonation – acting like someone else. The show had funny impersonation.

Implant – place inside something. Doctors implant tiny devices.

Implementation – putting a plan into action. Implementation began today.

Implore – beg strongly. She implored him to stay safe.

Import – bring goods from another country. Shops import toys.

Importance – value or significance. Education has great importance.

Important – very valuable or necessary. Water is important.

Importer – a person who brings goods from abroad. The importer sold fruits.

Impose – force something on someone. Rules impose limits.

Impression – a feeling about something. The movie made a good impression.

Impressive – making people admire. The tower looked impressive.

Imprint – mark left by pressure. The shoe made an imprint.

Improve – make better. Practice will improve skills.

Improvement – the act of becoming better. Her grades showed improvement.

Improviser – someone who creates things quickly. The actor was a good improviser.

Impulse – sudden desire to act. He bought candy on impulse.

Impulsive – acting quickly without thinking. The impulsive move caused trouble.

Impure – not clean or pure. The water looked impure.

Inability – lack of ability. His inability to swim worried him.

Inactive – not moving or working. The volcano is inactive.

Inadequate – not enough. The supply was inadequate.

Inanimate – not alive. A rock is inanimate.

Inborn – natural from birth. Kindness is an inborn trait.

Incense – fragrant smoke used in rituals. The temple burned incense.

Incentive – something that encourages action. A prize is an incentive.

Inception – beginning of something. The project had its inception last year.

Inch – small unit of length. The stick was twelve inches long.

Incident – an event. The incident happened yesterday.

Incidentally – by chance. Incidentally, I met your friend.

Incline – slope or lean. The road had a steep incline.

Inclusive – including everyone. The school is inclusive.

Income – money earned. Her income supports the family.

Incoming – arriving. We saw incoming mail.

Incomplete – not finished. The homework was incomplete.

Inconvenient – causing trouble. The time was inconvenient.

Increase – become bigger. Plants increase in size.

Incredible – amazing. The view was incredible.

Indeed – truly or really. She is indeed talented.

Independence – freedom from control. The country celebrated independence.

Independent – able to act alone. The cat is independent.

Index – list in a book. Use the index to find topics.

Indicate – show or point out. The arrow indicates the way.

Indicator – sign of something. Smoke is an indicator of fire.

Indigo – deep blue color. The sky looked indigo at night.

Indirect – not straight or direct. He gave an indirect answer.

Individual – a single person. Each individual matters.

Indoor – inside a building. We played indoor games.

Induce – cause something to happen. Rain may induce flooding.

Industry – work and business activity. Industry builds products.

Industrious – hardworking. The industrious student studied daily.

Inefficient – not working well. The old machine was inefficient.

Inevitable – certain to happen. Change is inevitable.

Inexact – not precise. The guess was inexact.

Inexpensive – not costly. The toy was inexpensive.

Infant – a very young baby. The infant slept quietly.

Infect – spread disease. Germs infect people.

Infection – illness caused by germs. He recovered from infection.

Infer – guess from facts. We infer meaning from clues.

Infinite – endless. Space seems infinite.

Infinity – endlessness. Numbers can go to infinity.

Inflate – fill with air. Please inflate the balloon.

Influence – effect on someone. Friends influence behavior.

Inform – tell someone something. Please inform the teacher.

Information – facts or details. Books give information.

Informative – giving useful facts. The lesson was informative.

Ingredient – part of a recipe. Sugar is an ingredient.

Inhabit – live in a place. Birds inhabit trees.

Inhabitant – a person or animal living in a place. The island has few inhabitants.

Inherit – receive from family. She will inherit the house.

Inheritance – something passed down. The ring was an inheritance.

Initial – first. This is the initial step.

Initiate – start something. They initiate the program.

Initiative – ability to start things yourself. She showed initiative.

Inject – put liquid into body with needle. Doctors inject medicine.

Injection – medicine given by needle. The nurse gave an injection.

Injure – hurt physically. Be careful not to injure yourself.

Injury – harm to the body. The injury healed soon.

Injustice – unfair treatment. The story spoke about injustice.

Inkpot – small container for ink. The writer used an inkpot.

Inland – away from the sea. The town is inland.

Inmate – a person living in an institution. The inmate followed rules.

Innkeeper – person who runs an inn. The innkeeper welcomed guests.

Innovation – new idea or method. Technology grows through innovation.

Innovative – introducing new ideas. The design was innovative.

Input – information put into a system. The computer needs input.

Inquiry – asking for information. The teacher answered the inquiry.

Insecticide – chemical that kills insects. Farmers use insecticide.

Insecure – not confident. He felt insecure.

Insert – put inside. Insert the key into the lock.

Insertion – act of putting in. The insertion was quick.

Inside – inner part. The toy is inside the box.

Insight – deep understanding. The book gave insight.

Insist – demand firmly. She insists on honesty.

Inspect – examine carefully. Workers inspect machines.

Inspection – careful checking. The car passed inspection.

Inspector – person who checks things. The inspector visited the site.

Inspire – fill with ideas. Stories inspire children.

Inspiration – creative influence. Nature is an inspiration.

Inscription – words written on stone or metal. The monument had an inscription.

Insulator – something that stops heat or electricity from passing through. Rubber is a good insulator.

Insurance – protection against loss or damage. The car has insurance.

Intact – not damaged or broken. The old book was still intact.

Integral – an important part of something. Reading is an integral part of learning.

Integrity – honesty and strong moral values. People trust those with integrity.

Intellect – the ability to think and understand. Her intellect helped solve the puzzle.

Intelligent – smart and quick to learn. The intelligent student answered quickly.

Intend – to plan or mean to do something. I intend to finish my homework.

Intense – very strong. The sun felt intense at noon.

Intensity – the strength of something. The storm had great intensity.

Interact – communicate or work together. Students interact during group work.

Interaction – action between people or things. Good interaction helps teamwork.

Interest – feeling of wanting to learn more. The story caught my interest.

Interesting – something that holds attention. The science lesson was interesting.

Interior – the inside part of something. The house interior looked beautiful.

Intermediate – between two levels. She joined an intermediate class.

Internal – inside something. The body has many internal organs.

International – between many countries. The event was international.

Internet – a global system of computers connected together. We searched the internet for information.

Interpret – explain the meaning of something. The teacher helped interpret the poem.

Interpreter – a person who translates spoken language. The interpreter helped the visitors.

Interrupt – stop someone while they are speaking. Please do not interrupt the teacher.

Interval – a short break between things. There was an interval during the play.

Intervene – step in to help or stop a problem. The teacher intervened in the argument.