Webster's English Dictionary

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unison

uni.son \'yu:-n*-s*n, -n*-z*n\ n [MF, fr. ML unisonus having the same 
   sound, fr. L uni- + sonusX sound - more at SOUND 1a: identity in musical 
   pitch; specif : the interval of a perfect p rime 1b: the state of being so 
   tuned or sounded  1c: the writing, playing, or singing of parts in a 
   musical passage at the s ame pitch or in octaves 2: a harmonious agreement 
   or union : CONCORD  - unison aj