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unison (n.)

1570s, "note having the same pitch as another; identity in pitch of two or more sounds; interval between tones of the same pitch," especially the interval of an octave, from French unisson "unison, accord of sound" (16c.) or directly from Medieval Latin unisonus "having one sound, sounding the same," from Late Latin unisonius "in immediate sequence in the scale, monotonous," from Latin uni- "one" (from PIE root *oi-no- "one, unique") + sonus "sound" (from PIE root *swen- "to sound"). Figurative sense of "harmonious agreement" is first attested 1640s.

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Definitions of unison from WordNet

unison (n.)
corresponding exactly;
marching in unison
unison (n.)
occurring together or simultaneously;
the two spoke in unison
unison (n.)
(music) two or more sounds or tones at the same pitch or in octaves;
singing in unison
From wordnet.princeton.edu