repeater

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that repeats.
• noun A watch or clock with a pressure-activated mechanism that strikes the hour.
• noun A repeating firearm.
• noun A device used to amplify digital or analog signals in order to strengthen them for retransmission, as on a computer network or in telephone or radio transmission.
• noun A student who repeats a course, usually one that has been failed.
• noun One who fraudulently votes more than once in a single election.
• noun One who has been convicted of wrongdoing more than once, especially for the same offense.

from The Century Dictionary.

• noun In telephony, an instrument for reproducing in one circuit a message received over another circuit and of so enhancing its intensity as to enable its transmission to a greater distance than would otherwise be practicable.
• noun One who repeats; one who recites or rehearses.
• noun A watch that, on the compression of a spring, strikes the last hour. Some also indicate the quarters, or even the hours, quarters, and odd minutes.
• noun In arithmetic, an interminate decimal in which the same figure continually recurs.
• noun One who votes or attempts to vote more than once for one candidate at an election.
• noun A repeating firearm.
• noun Nautical:
• noun A vessel, usually a frigate, appointed to attend an admiral in a fleet, and to repeat any signal he makes, with which she immediately sails to the ship for which it is intended, or the whole length of the fleet when the signal is general. Also called repeating ship.
• noun A flag which indicates that the first, second, or third flag in a hoist of signals is to be repeated.
• noun In telegraphy, an instrument for automatically retransmitting a message at an intermediate point, when, by reason of length of circuit, defective insulation, etc., the original line current becomes too feeble to transmit intelligible signals through the whole circuit.
• noun In calico-printing, a figure which is repeated at equal intervals in a pattern.

from the GNU version of the Collaborative International Dictionary of English.

• noun U.S., U.S. A watch with a striking apparatus which, upon pressure of a spring, will indicate the time, usually in hours and quarters.
• noun U.S., U.S. A repeating firearm.
• noun (Teleg.), U.S., U.S. An instrument for resending a telegraphic message automatically at an intermediate point.
• noun U.S. A person who votes more than once at an election.
• noun See Circulating decimal, under decimal.
• noun (Naut.) A pennant used to indicate that a certain flag in a hoist of signal is duplicated.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun electronics An electronic device that receives a weak or low-level signal and retransmits it at a higher level or higher power.
• noun firearms A gun that has a store of cartridges and does not need reloading after each shot.
• noun In ufology and similar studies, a person who regularly sees unexplained sightings of paranormal phenomenon.
• noun A watch with a striking apparatus which, upon pressure of a spring, will indicate the time, usually in hours and quarters.
• noun US One who votes more than once at an election.
• noun A repeating decimal.
• noun nautical A pennant used to indicate that a certain flag in a hoist of signal is duplicated.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a firearm that can fire several rounds without reloading
• noun (electronics) electronic device that amplifies a signal before transmitting it again
• noun a person who repeats
• noun someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior)