| 1. | Music. semitone. |
| 2. | Military. a step 15 in. (38 cm) long in quick time and 18 in. (46 cm) long in double time. |
[sem-ee-tohn, sem-ahy-] 
| a pitch interval halfway between two whole tones. |
[sem-ee-ton-ik, sem-ahy-] , sem⋅i⋅ton⋅al [sem-ee-tohn-l, sem-ahy-] , adjective | half step n.
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| sem·i·tone (sěm'ē-tōn', sěm'ī-) n. Music An interval equal to a half tone in the standard diatonic scale. Also called half step, halftone. sem'i·to'nal adj., sem'i·to'nal·ly adv. |