Longman Dictionary of Contemporary English homepage

indoor

 adjective
     
in‧door [only before noun]
used or happening inside a building [≠ outdoor]:
an indoor swimming pool
the world indoor athletics championship
Too much central heating can harm indoor plants.
! Do not confuse indoor and indoors. Indoor is an adjective and indoors is an adverb: I stayed indoors (NOT I stayed indoor). | indoor sports (NOT indoors sports)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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