witnessed Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition past tense verb. to watch or be present at; to prove that a will or other legal paper was signed properly by signing it oneself. Example Sentence This old auditorium has witnessed many ceremonies. Synonyms attend; watch; sign; eyewitness; spectator Antonyms disproof Hear It! Say It! Write It! witnessed Switch to cursive Start Share with your friends: