outdoors (English) comes from English out, from Middle English oute, from Old English ūt, from Proto-West Germanic *ūt, from Proto-Germanic ūt, from Proto-Indo-European úd — out, outward.
outdoors (English): Not inside a house or under covered structure;...
Definitions
Not inside a house or under covered structure;...
Ancestry of “outdoors”, step by step
outdoors traces back through two separate lines of ancestry.