Princeton's WordNet

1. outdoor(a), out-of-door, outside(adj)

   located, suited for, or taking place in the open air

   "outdoor clothes"; "badminton and other outdoor games"; "a beautiful outdoor setting for the wedding"

2. outdoor(adj)

   pertaining to or concerning the outdoors or outdoor activities

   "outdoor education is the area of teacher training concerned with training for outdoor activities"

Kernerman English Learner's Dictionary

1. outdoor(adjective)ˈaʊtˌdɔr, -ˌdoʊr

   to be used outside rather than inside a building

   a store that sells camping and outdoor gear; an outdoor swimming pool

Wiktionary

1. outdoor(Adjective)

   Situated in, designed to be used in, or carried on in the open air.

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