postmarked Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to mark a letter with the date it is sent. Example Sentence The letter was postmarked two days ago. More Example Sentences He checked the postmarked date on the envelope. Synonyms dated; stamped; canceled Antonyms letter; envelope Hear It! Say It! Write It! postmarked Switch to cursive Start Share with your friends: