validates Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. 1 to prove valid or acceptable; verify; 2.to make valid by legal means. Example Sentence Your signature validates the contract. Synonyms formalize; authorize; confirm; ratify Antonyms invalidate; annul; quash; void; avoid; nullify Hear It! Say It! Write It! validates Switch to cursive Start Share with your friends: