semitone - definition and synonyms

noun [countable] music British 

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/ˈsemiˌtəʊn/
singularsemitone
pluralsemitones
  1. an amount by which one sound is higher or lower than another, equal to 1/12 of an octave. This difference can be heard between any two notes that are next to each other on a piano.
     Synonyms and related words