From The Collaborative International Dictionary of English v.0.48 [gcide]:
Unison \U"ni*son\ (?; 277), n. [LL. unisonus having the same
sound; L. unus one + sonus a sound: cf. F. unisson, It.
unisono. See {One}, and {Sound} a noise.]
1. Harmony; agreement; concord; union.
[1913 Webster]
2. (Mus.) Identity in pitch; coincidence of sounds proceeding
from an equality in the number of vibrations made in a
given time by two or more sonorous bodies. Parts played or
sung in octaves are also said to be in unison, or in
octaves.
[1913 Webster]
Note: If two cords of the same substance have equal length,
thickness, and tension, they are said to be in unison,
and their sounds will be in unison. Sounds of very
different qualities and force may be in unison, as the
sound of a bell may be in unison with a sound of a
flute. Unison, then, consists in identity of pitch
alone, irrespective of quality of sound, or timbre,
whether of instruments or of human voices. A piece or
passage is said to be sung or played in unison when all
the voices or instruments perform the same part, in
which sense unison is contradistinguished from harmony.
[1913 Webster]
3. A single, unvaried. [R.] --Pope.
[1913 Webster]
{In unison}, in agreement; agreeing in tone; in concord.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Unison \U"ni*son\ (?; 277), a. [Cf. It. unisono. See {Unison},
n.]
1. Sounding alone. [Obs.]
[1913 Webster]
[sounds] intermixed with voice,
Choral or unison. --Milton.
[1913 Webster]
2. (Mus.) Sounded alike in pitch; unisonant; unisonous; as,
unison passages, in which two or more parts unite in
coincident sound.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
unison
n 1: corresponding exactly; "marching in unison"
2: occurring together or simultaneously; "the two spoke in
unison"
3: (music) two or more sounds or tones at the same pitch or in
octaves; "singing in unison"
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