out ‧ door /ˌaʊtˈdɔː◂ $ -ˈdɔːr◂/ BrE AmE adjective
1 . [only before noun] existing, happening, or used outside, not inside a building OPP indoor :
a huge outdoor market
outdoor recreational activities
outdoor clothing
a healthy outdoor life
2 . outdoor type someone who enjoys camping, walking in the countryside etc
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GRAMMAR
outdoor, outdoors
Outdoor is an adjective and outdoors is an adverb:
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They could play outdoors (NOT outdoor) all year round.
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an outdoor (NOT outdoors) swimming pool