Repeater (noun)

1. A device that receives a signal and amplifies it to increase its range or strength.
2. A person who repeats something that they have heard or seen.
3. A person who performs the same action or task repeatedly.

Origin:

The word comes from the verb "repeat" meaning "to say or do something agai.n"

Examples:

1. I installed a repeater to boost the wireless signal in my house.
2. She was a repeater and would always repeat what she heard.
3. The repeater in the train station helped the signal stay strong throughout the trip.
4. He was a repeater in mathematics and had to retake the class.
5. She was a repeater in the spelling bee and knew all the words.