inside

The word “inside” means the interior or inner part of something. In plain terms, the interior part of something, or moving/being within it, physically or informally (as in "inside knowledge").

“Inside” is pronounced IHN-syd (/ˈɪnsaɪd/ in IPA).

Here is “inside” used in a sentence: “The inside of the house had been freshly painted.”

The opposite of “inside” — its antonyms — is outside.

Depending on how it is used, “inside” can be a noun, an adjective, an adverb and a preposition.

The word “inside” comes from Middle English. From Middle English ynneside, formed from in + side.

“Inside” is a very common word in modern English, usually learned at around the A1 level.

“Inside” has 5 distinct senses listed in this dictionary. The most common is: the interior or inner part of something.

The opposite is "outside" or "exterior." As a noun, the inside is the inner part of something, while the outside is its outer surface or surroundings. The inside of a house is its rooms; the outside is its walls and garden. The pair marks interior against exterior.

They point to the same thing — the inner part of something — but differ in tone. "Inside" is the everyday word, used in ordinary speech. "Interior" is more formal or technical, common in design, architecture, and cars. You clean the inside of a mug but admire a building's interior.

Yes. As a noun it means the inner part. It also works as a preposition ("inside the box"), an adverb ("let's go inside"), and an adjective ("an inside pocket"). The core idea of being within stays the same across all of these uses.

"The inside of the car was spotless" points to its interior. You might paint the inside of a cupboard, or feel butterflies inside. In each case the noun names the inner part or space of something rather than its outer surface.