verb (used with object)
to say or utter again (something already said): to repeat a word for emphasis.
to say or utter in reproducing the words, inflections, etc., of another: to repeat a sentence after the teacher.
to reproduce (utterances, sounds, etc.) in the manner of an echo, a phonograph, or the like.
to tell (something heard) to another or others.
to do, make, or perform again: to repeat an action.
to go through or undergo again: to repeat an experience.
verb (used without object)
to do or say something again.
to cause a slight regurgitation: The onions I ate are repeating on me.
to vote illegally by casting more than one vote in the same election.
the act of repeating.
something repeated; repetition.
a duplicate or reproduction of something.
a decorative pattern repeated, usually by printing, on a textile or the like.
a passage to be repeated.
a sign, as a vertical arrangement of dots, calling for the repetition of a passage.
a radio or television program that has been broadcast at least once before.

1325–75; Middle English repeten (v.) < Middle French repeter < Latin repetere to attack again, demand return of, equivalent to re- re- + petere to reach towards, seek (cf. perpetual, petulant)

repeatable, adjective
repeatability, noun
nonrepeat, noun
self-repeating, adjective
unrepeatable, adjective

1. iterate, recite, rehearse. 1, 5. Repeat, recapitulate, reiterate refer to saying a thing more than once. To repeat is to do or say something over again: to repeat a question, an order. To recapitulate is to restate in brief form, to summarize, often by repeating the principal points in a discourse: to recapitulate an argument. To reiterate is to do or say something over and over again, to repeat insistently: to reiterate a refusal, a demand. 3. echo, reecho. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
repeat (rɪˈpiːt)
1.  (when tr, may take a clause as object) to say or write (something) again, either once or several times; restate or reiterate
2.  to do or experience (something) again once or several times
3.  (intr) to occur more than once: the last figure repeats
4.  (tr; may take a clause as object) to reproduce (the words, sounds, etc) uttered by someone else; echo
5.  (tr) to utter (a poem, speech, etc) from memory; recite
6.  (intr)
 a.  (of food) to be tasted again after ingestion as the result of belching or slight regurgitation
 b.  to belch
7.  (tr; may take a clause as object) to tell to another person (the words, esp secrets, imparted to one by someone else)
8.  (intr) (of a clock) to strike the hour or quarter-hour just past, when a spring is pressed
9.  (US) (intr) to vote (illegally) more than once in a single election
10.  repeat oneself to say or do the same thing more than once, esp so as to be tedious
11.  a.  the act or an instance of repeating
 b.  (as modifier): a repeat performance
12.  a word, action, etc, that is repeated
13.  an order made out for goods, provisions, etc, that duplicates a previous order
14.  a duplicate copy of something; reproduction
15.  radio, television a further broadcast of a programme, film, etc, which has been broadcast before
16.  music a passage that is an exact restatement of the passage preceding it
[C14: from Old French repeter, from Latin repetere to seek again, from re- + petere to seek]
usage  Since again is part of the meaning of repeat, one should not say something is repeated again

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. repeter "say or do again, get back, demand the return of" (13c.), from L. repetere "do or say again, attack again," from re- "again" + petere "go toward, seek, demand, attack" (see petition). Specific meaning "to take a course of education over again"
is recorded from 1945, Amer.Eng. The noun is first recorded 1556.
Online Etymology Dictionary, © 2010 Douglas Harper
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