sir Get Printable Handwriting (sir) 1 syllables Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a polite way to address a man. Example Sentence Please address the gentleman as sir. More Example Sentences A sir walked into the room. Synonyms mister; gentleman Antonyms mam Hear It! Say It! Write It! sir Switch to cursive Start Share with your friends: