| I | definition | example sentence |
| ice | frozen water | Would you like some ice in your drink? |
| ice cream | a frozen dessert food | If I eat too much ice cream, I start to put on weight. |
| importance | the degree to which something is important | The research shows the importance of regular exercise. |
| inflation | rising prices | Inflation has made everything more expensive than before. |
| information | facts about something or someone | Do you think the information on this website is accurate? |
| injustice | unfair treatment | Nelson Mandela spent most of his life fighting injustice. |
| innocence | the fact of not being guilty of a crime | Despite their innocence, many good people were sent to jail. |
| intelligence | the ability to think about complex ideas | Do you think IQ tests really measure intelligence? |
| iron | a strong metal (symbol Fe) | In ancient Rome, knives and spear tips were made of iron. |
| irony | humour in which someone says the opposite of what they really mean | As we stood in the rain, Julie said, with much irony, "Lovely weather, isn't it?" |
| J | definition | example sentence |
| jam | sweet food made from fruit and spread on bread | Can I have some strawberry jam on my toast, please? |
| jealousy | a bad feeling experienced if we think someone we love wants someone else | If she even looks at another guy, her boyfriend goes crazy with jealousy. |
jelly (British) | a dessert made with gelatine | Mum made some red jelly for dessert. |
| jelly (USA) | sweet food made from fruit and spread on bread | Can I have one of your peanut butter and jelly sandwiches? |
| joy | a feeling of great happiness | When I held our first baby, tears of joy ran down my cheeks. |
| judo | a martial art that employs throws and holds | Did you know that judo is an Olympic sport now? |
| juice | any liquid that's squeezed from fruit | Every morning I have a glass of freshly-squeezed orange juice. |
| justice | the fair treatment of people | Those boys who were jailed for a crime they didn't commit are still waiting for justice. |