a person who repeats
"the audience consisted largely of repeaters who had seen the movie many times"
someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior)
"The judge sighed when he realized that another repeater had been caught stealing from a convenience store yet again."
a firearm that can fire several rounds without reloading
"The hunter's repeater rifle allowed him to take down three rabbits in quick succession before he had to stop and reload."
(electronics) electronic device that amplifies a signal before transmitting it again
"repeaters can be used in computer networks to extend cabling distances"
One who or that which repeats.
"The old dog acted as a repeater for his owner, barking back at visitors whenever they spoke to him from across the yard."