validate Get Printable Handwriting (val-i-date) 3 syllables Rhymes Learn It! Spelling Test Definition verb. 1 to prove valid or acceptable; verify 2 to make valid by legal means Example Sentence He cited studies to validate his theory. Synonyms formalize; authorize; confirm; ratify Antonyms invalidate; annul; quash; void; avoid; nullify Rhymes Three Syllable Rhymes (1) validate Share with your friends: