Hypertext Webster Gateway: "Postmarked"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Postmark \Post"mark`\, v. t. [imp. & p. p. {Postmarked}; p. pr.
& vb. n. {Postmarking}.]
To mark with a post-office stamp; as, to postmark a letter or
parcel.
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