unison

[yoo-nuh-suhn, -zuhn]
noun
1.
coincidence in pitch of two or more musical tones, voices, etc.
2.
the musical interval of a perfect prime.
3.
the performance of musical parts at the same pitch or at the octave.
4.
a sounding together in octaves, especially of male and female voices or of higher and lower instruments of the same class.
5.
a process in which all elements behave in the same way at the same time; simultaneous or synchronous parallel action: to march in unison.
Idioms
6.
in unison, in perfect accord; corresponding exactly: My feelings on the subject are in unison with yours.

Origin:
1565–75; < Medieval Latin ūnisonus of a single sound, equivalent to Latin ūni- uni- + sonus sound

nonunison, noun
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World English Dictionary
unison (ˈjuːnɪsən, -zən)
 
n
1.  music
 a.  the interval between two sounds of identical pitch
 b.  (modifier) played or sung at the same pitch: unison singing
2.  complete agreement; harmony (esp in the phrase in unison)
 
[C16: from Late Latin ūnisonus, from uni- + sonus sound]
 
u'nisonous
 
adj
 
u'nisonal
 
adj
 
u'nisonant
 
adj

UNISON (ˈjuːnɪsən)
 
n
(in Britain) a trade union representing local government, health care, and other workers: formed in 1993 by the amalgamation of COHSE, NALGO, and NUPE

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

unison
1574, from M.Fr. unisson "unison, accord of sound" (16c.), from M.L. unisonus "having one sound, sounding the same," from L.L. unisonius "in immediate sequence in the scale, monotonous," from L. uni- "one" (see one) + sonus "sound" (see sound (n.1)).
Sense of "harmonious agreement" is first attested 1650.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

unison definition


Playing or singing the same musical notes, or notes separated from each other by one or several octaves. Musicians who perform in unison are not playing or singing chords.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
In some places the firefly dance is synchronized, with the insects flashing in
  unison or in waves.
Once the cells grew closer together and contacted each other, they began to
  beat in unison.
Even in religious matters the people were more in unison than ever before or
  since.
Thousands of fireflies blinked on and then off in unison, a huge collective
  mating call to get the females' attention.
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