ex Get Printable Handwriting (ex) 1 syllables Hear It! Say It! Write It! Learn It! Spelling Test Definition prefix. out of or from or former; noun. a person who was formerly one's spouse Example Sentence The prefix ex is used in the words exit and ex-president. Synonyms out of; from; former spouse Antonyms in; future Hear It! Say It! Write It! ex Switch to cursive Start Share with your friends: