semitone

An interval equal to a half tone in the standard diatonic scale.

In music, an interval approximately equal to half of a tone; a minor second; a half-step.

Half a tone; — the name commonly applied to the smaller intervals of the diatonic scale.

(UK, Ireland, Australia, New Zealand) The musical interval equal (exactly or approximately) to half a tone or one-twelfth of an octave

(UK, Ireland, Australia, New Zealand) Any of the pitches of the chromatic scale

the musical interval between adjacent keys on a keyboard instrument