postmarked Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. stamp with an official mark to indicate cancellation of the postage stamp and the place and date and sometimes time of sending or receipt Example Sentence The letter was postmarked two days ago. Synonyms date stamped; cancellation of postage stamp; frank Antonyms letter; envelope Hear It! Say It! Write It! postmarked Switch to cursive Start Share with your friends: