repeater (Noun) — A person who repeats. ex. "the audience consisted largely of repeaters who had seen the movie many times"
repeater (Noun) — Someone who is repeatedly arrested for criminal behaviour (especially for the same criminal behaviour).
repeater (Noun) — A firearm that can fire several rounds without reloading.
repeater (Noun) — (electronics) electronic device that amplifies a signal before transmitting it again. ex. "repeaters can be used in computer networks to extend cabling distances"