"outdoors" in the noun sense
1. outdoors, out-of-doors, open air, open
where the air is unconfined
"he wanted to get outdoors a little"
"the concert was held in the open air"
"camping in the open"
"outdoors" in the adverb sense
1. outside, outdoors, out of doors, alfresco
outside a building
"in summer we play outside"
Source: WordNet® (An amazing lexical database of English)
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