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1) A device that receives, amplifies (and sometimes reshapes), and retransmits a signal. It is used to boost signal levels and extend the distance a signal can be transmitted. In radio terms, the signal is usally recieved on a input frequency and then retransmitted on a different frequency (output or direct).

2) A network device that repeats signals from one cable onto one or more other cables, while restoring signal timing and waveforms. Repeaters are the most common way to connect local networks together, and can provide either Thinwire or Thickwire connections. They are commonly used to create larger local networks up to a certain limit based on the number of repeaters and the length of the cables.

3) A device inserted at intervals along a circuit to boost, and amplify an analog signal being transmitted. A repeater is sometimes needed because the quality and strength of a signal decays over distance. Repeaters are also used to regenerate a digital signal - "squaring it" and "cleaning it up" - but not changing it. You can regenerate digital signals because technology exists that can separate the actual signal from the noise, regenerating only the signal. No technology exists that can do this with analog signals. The simplest type of LAN interconnection device is a repeater. A repeater moves all received packets or frames between LAN segments. The primary function of a repeater is to extend the length of the network media, i.e. the cable.

4) someone who is repeatedly arrested for criminal behavior

5) a firearm that can fire several rounds without reloading
The Fairfax County Public Schools use digital trunked repeaters that operate in the 800 MHz range for thier school buses.

The criminal (in your case) used a repeater to kill the police officer.
repeater by IrishRepublicanArmy December 26, 2003
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Outfit Repeater 

An individual who wears the same outfit (a set of clothing) more than once. Seems to be more of a female thing because it doesn't really apply to males.
Girl 1: Hi
Girl 2: Hello...OMG didn't I see you wearing those jeans and tops last week?
Girl 1: Ummmm....I dunno.
Girl 2: OMG EWWWWWW OUTFIT REPEATER!
Outfit Repeater by Johnny Cool 8 December 28, 2008
A person who needlessly repeats a punch line.
"Three Pearls"!
Group: "HAHAHA"
Repeater: "Three Pearls..."
Group: "..."
Repeater by LJ612P June 22, 2007
Someone that likes to repeat everything they say over and over again without refuse. Often times this can be very annoying to fellow females in the group and can create contempt towards this individual. The repeated vocabulary is frequently a catch phrase or idiom that was created as an inside joke within his/her circle of friends, yet no one understands what it is they are trying to convey.
That Dave Lee character is quite the repeater. I think he is scaring away all of the ladies with his obnoxious repeating.

Lancaster Repeater 

The best weapon in Red Dead Redemption since the invention of Micha Bazooka
Whaaaat?! you got the lengendary lancaster repeater?
Lancaster Repeater by Chijon15 November 13, 2019
The male equivalent to a multiple orgasm / squirter / cummer in the female. The male cums more than once in the same fuck, sometimes rapidly - giving the impression of a very much longer than usual jet of hot cum, without losing the erection or resting. The fuck can change position; i.e hand, tits, mouth, ass, pussy, feet, more than one sex partner at the same time etc with hot jets of cum all the way through sex. Even right upto the end!
"A good hard cock and I'll cum buckets but Jeff was something else - an endless stream of hot salty cum. I've landed myself a repeater! Yum, Yum!! I know what I want for lunch!"
repeater by skipper johnson January 6, 2009

repeatard 

A nuisance who repeats every funny thing you say or do, and becomes popular from doing so. Usually has the mental capacity of a Yu-Gi-Oh fan. See Yu-Gi-Schmoe
<Repeatard> LOZL!!111?/ Kets go nad palay YugiOH!1 Oh, YUgiOh is roxckint!!1 HAah d I wihs i weres a yugiohpe!1/