Definition of “indoor” - English Dictionary

“indoor” in British English

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indooradjective [ before noun ]

uk /ˌɪnˈdɔːr/ us /ˌɪnˈdɔːr/

A2 happening, used, or existing inside a building:

Opposite

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(Definition of “indoor” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“indoor” in American English

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indooradjective [ not gradable ]

us /ˈɪnˌdɔr, -ˌdoʊr/

happening, used, or being inside a building:

indoor sports
indoor plumbing
an indoor swimming pool
indoors
adverb [ not gradable ] us /ˌɪnˈdɔrz, -ˈdoʊrz/

Come indoors, it’s cold outside.

(Definition of “indoor” from the Cambridge Academic Content Dictionary © Cambridge University Press)