Definitions for: Semitone

[n] the musical interval between adjacent keys on a keyboard instrument

Webster (1913) Definition: Sem"i*tone, n. [Pref. semi- + tone. CF. Hemitone.]
(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. --J. S. Dwight.

Synonyms: half step

See Also: interval, musical interval