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Definitions of unison:

noun:   (music) two or more sounds or tones at the same pitch or in octaves
Example: "Singing in unison"

noun:   occurring together or simultaneously
Example: "The two spoke in unison"

noun:   corresponding exactly
Example: "Marching in unison"

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Alternative Terms
octave chord inversion semitone interval-class just-intonation cent-music equal-temperament music interval pitch-music consonance-and-dissonance tuning-3 timbre waveform frequency harmonic choir a-cappella monophony metaphor tandem homophony-3 barbershop-quartet-2 hymn polyphony synthesizer oscillation analog-modeling-synthesizer sawtooth-wave techno-2007 trance-music perfect-fourth perfect-fifth major-second major-third major-sixth major-seventh minor-third minor-sixth minor-seventh augmented-second tritone augmented-fifth augmented-sixth diminished-second diminished-third diminished-fourth diminished-seventh diminished-octave unisonous agreeable unisonal unisonance unisonant division contralateral rockettes asynergia agree accordance rotary-shear sallying-ship universal-chuck

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