Definition of "postmarked" [postmarked]

• Simple past tense and past participle of postmark. (verb)

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• "They mailed the "Hotel book" out from the travel agent the date I called them 30 days later "postmarked"."
• "The press release says ballots must be postmarked Feb. 28th at the latest; the ballot says that ballots must be received by Mar. 1st."
• "Any shipments postmarked 4/22 or later will be returned to sender."