Etymology
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outdoors (adv.)

"in the open air, out of the house," 1817, from outdoor + adverbial genitive -s. As a noun, "open spaces," it is recorded from 1857; the great outdoors is recorded by 1932. Out a doors (adv.) is from 1520s.

updated on October 15, 2019

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Definitions of outdoors from WordNet
1
outdoors (n.)
where the air is unconfined;
he wanted to get outdoors a little
Synonyms: out-of-doors / open air / open
2
outdoors (adv.)
outside a building;
Synonyms: outside / out of doors / alfresco
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.