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English definition of “semitone”

semitone

noun [C or]     /ˈsem.i.təʊn/ US  /-toʊn/ (US usually half step)
the smallest difference in sound between two notes that are next to each other in the western musical scaleNotes of the musical scale
(Definition of semitone noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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