inin /ɪn/ preposition, adverb 1 
used to mention the place or container where something is► in preposition
used to mention the place or container where something is► in preposition used to mention the place where someone or something is, or the container where something is: My sister lives in Pittsburgh. Jim’s watching TV in his room. There’s some juice in the refrigerator.
► at preposition used to say exactly where someone or something is: I was waiting at the bus stop. Let’s meet at Bill’s house.
► on preposition used to mention a particular place where someone or something is: Napoleon spent the rest of his life on the island of St. Helena. Los Angeles is on the west coast. His office is on the fifth floor.
► inside preposition, adverb in a container or building: What is inside the box? It was dark inside the church. He shook the box, trying to guess what was inside.
► indoors adverb in a building: Our dog gets bored if he is left indoors all day.
2 to the inside of something► in preposition, adverb to the inside of a room, vehicle, or container, especially to the place where you are or that you have just mentioned: When I knocked at the door, the principal said “Come in!” Put the scissors back in the drawer. ➔ After the verbs “put,” “throw,” drop,” and “look” it is more natural to use in rather than into: I dropped my book in the mud.
► into preposition to the inside of a room, vehicle, or container: She went into the living room. Pour the milk into a pan.
► inside preposition, adverb into a building or container: It started to rain, so we went inside. I looked inside the closet for my shoes.
► indoors adverb into a building: You should bring the plant indoors for the winter.
ANTONYMS ➔ see out1