situated away from the inside or center; farther or farthest away from the inside or center: the outside lane. not belonging to or connected with a specified institution, society, etc.: outside influences; outside help.

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When someone goes out of a building, you don't usually say that they go `outdoors'. You say that they go outside. Outdoor is an adjective used in front of a noun. You use it to describe things or activities that exist or happen in the open air, rather than inside a building.

Outside is an adverb, an adjective, a preposition or a noun. We use outside as an adverb or an adjective to mean 'not in a building': It was sunny outside, but not very warm. (