Etymology
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workaday 
c. 1200, werkedei (n.), "day designated for labor rather than religious observance or rest," from Old Norse virkr dagr "working day;" see work (n.) + day. It passed into an adjective 16c.
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workday (n.)
Old English weorcdæg, from work (n.) + day (n.). The modern word is perhaps a Middle English re-formation. As an adjective (c. 1500) it has generally only the literal sense (compare workaday).
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