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semitone

play
noun semi·tone \ˈse-mē-ˌtōn, ˈse-ˌmī-, -mi-\

Simple Definition of semitone

  • music : a difference in sound that is equal to 1/12 of an octave

Full Definition of semitone

  1. :  the tone at a half step; also :  half step

semi·ton·ic play \ˌse-mē-ˈtä-nik, ˌse-ˌmī-, -mi-\ adjective
semi·ton·i·cal·ly play \-ni-k(ə-)lē\ adverb

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