Etymology
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someday (adv.)

"at some indefinite future date," 1768, from some + day. As two words, in the same sense, from late 14c.

MISS SOMEDAY.
Poor Charley wooed, but wooed in vain,
From Monday until Sunday;
Still Cupid whisper'd to the swain
"You'll conquer Betsey Someday."
[The Port Folio, June 1816]
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Definitions of someday

someday (adv.)
some unspecified time in the future;
someday you will understand my actions
From wordnet.princeton.edu