UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌɪnˈdɔːr/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈɪnˌdɔr/ ,USA pronunciation: respelling(indôr′, -dōr′)

WordReference Random House Learner's Dictionary of American English © 2020
in•door /ˈɪnˌdɔr/USA pronunciation   adj. 
  1. located, used, or existing inside a building:indoor plumbing.

WordReference Random House Unabridged Dictionary of American English © 2020
in•door  (indôr′, -dōr′),USA pronunciation adj. 
  1. occurring, used, etc., in a house or building, rather than out of doors:indoor games.
  • aphetic variant of within-door, origin, originally phrase within (the) door, i.e., inside the house 1705–15

Collins Concise English Dictionary © HarperCollins Publishers::
indoor /ˈɪnˌdɔː/ adj (prenominal)
  1. of, situated in, or appropriate to the inside of a house or other building: an indoor tennis court, indoor amusements
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