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indoor (adj.)

also in-door, 1670s, opposed to outdoor, contracted from within door; the form indoors is attested from 1759 (within-doors is from 1750); as an adverb from 1801.

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Definitions of indoor from WordNet

indoor (adj.)
located, suited for, or taking place within a building;
indoor activities for a rainy day
an indoor pool
indoor (adj.)
within doors;
an indoor setting
From wordnet.princeton.edu