semitone
/ˈsɛmɪtoʊn/
noun
- The smallest interval between two notes in Western music, equal to half a step on a piano keyboard (e.g., from C to C-sharp).
- The melody moves up by a semitone, creating a tense feeling.
- On a guitar, moving your finger one fret changes the pitch by a semitone.
- She practiced playing scales in semitones to improve her ear.