Definition of first day
1
usually capitalized F
: sunday
—used chiefly by the Friends
2a
: a day when the postage stamps of a new issue are first placed on sale
especially
: one on which recognition of the event is made by special cancellations and often by cachets on mail bearing the stamps
b
: first day cover
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Merriam-Webster unabridged
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Time Traveler for first day
The first known use of first day was in 1649
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