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Word Origins Dictionary
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outdoor (adj.)
1748, from
out
+
door
.
Out-of-door
is from c. 1800.
outdoors (adv.)
1817, from
outdoor
+ adverbial genitive. As a noun, "open spaces," recorded from 1857.
outdoorsman (n.)
1924, American English, from
outdoors
+
man
(n.).