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Noun: unison  yoo-ni-sun
  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"

Derived forms: unisons

Type of: accord, agreement, coincidence, concert, concurrence, conjunction, co-occurrence, sound

Encyclopedia: Unison, Virginia