actuate Get Printable Handwriting (ac-tu-ate) 3 syllables Rhymes Learn It! Spelling Test Definition verb. 1 to put into action or motion; 2 to cause to take action Example Sentence Will this switch actuate this machine? Synonyms trip; trigger; activate; set off; spark off Antonyms stop Rhymes Three Syllable Rhymes (1) actuate Share with your friends: