first-day cover

[ furst-dey, -dey ]

noun

, Philately.

1. a cover marked so as to indicate that it was mailed on the first day of issue of the stamp it bears and from one of the cities at which the stamp was issued on that day.

first-day cover

noun

1. philately a cover, usually an envelope, postmarked on the first day of the issue of its stamps

Word History and Origins

Origin of first-day cover¹

First recorded in 1935–40