semi·tone /ˈsɛmiˌton, ˈsɛˌmaɪ, mɪ-/
Sem·i·tone n. Mus. Half a tone; -- the name commonly applied to the smaller intervals of the diatonic scale.
Note: ☞ There is an impropriety in the use of this word, and half step is now preferred. See Tone.
n : the musical interval between adjacent keys on a keyboard
instrument [syn: half step]