"mark or stamp of a post office placed on a letter, etc., giving the place and date of sending," 1670s, from post (n.3) + mark (n.1). As a verb from 1716. Related: Postmarked; postmarking.
postillon
post-impressionism
Post-it
postlude
postman
postmark
postmaster
post-millennial
postmistress
post-modern
postmodernism
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