Semitone (English Wikipedia)

Semitone, half step, half tone, halftone, and half-tone are all variously used in sources.
Aaron Copland, Leonard Bernstein, and others use "half tone".
One source says that step is "chiefly US", and that half-tone is "chiefly N. Amer."^{[link removed]}
Capstick, John Walton (1913). Sound: An Elementary Text-book for Schools and Colleges. Cambridge University Press.
Duffin, Ross W. (2008). How equal temperament ruined harmony : (and why you should care) (First published as a Norton paperback. ed.). New York: W. W. Norton. p. 163. ISBN 978-0-393-33420-3. Retrieved 28 June 2017.

digitale-sammlungen.de (Global: 443^rd place; English: 1,820^th place)

Fonville, J. (Summer 1991). "Ben Johnston's extended just intonation – a guide for interpreters". Perspectives of New Music. 29 (2): 106–137. doi:10.2307/833435. JSTOR 833435. ... the ⁠25/24⁠ ratio is the sharp (♯) ratio ... this raises a note approximately 70.6 cents.^(p109)

Blood, Brian (12 September 2014). "Intervals". Music theory online. Dolmetsch Musical Instruments. Retrieved 30 August 2015.

Fonville, J. (Summer 1991). "Ben Johnston's extended just intonation – a guide for interpreters". Perspectives of New Music. 29 (2): 106–137. doi:10.2307/833435. JSTOR 833435. ... the ⁠25/24⁠ ratio is the sharp (♯) ratio ... this raises a note approximately 70.6 cents.^(p109)

Semitone, half step, half tone, halftone, and half-tone are all variously used in sources.
Aaron Copland, Leonard Bernstein, and others use "half tone".
One source says that step is "chiefly US", and that half-tone is "chiefly N. Amer."^{[link removed]}

Rushton, Julian. "Unison (prime)". Grove Music Online. Oxford Music Online. Retrieved 17 August 2011. (subscription needed)

Semitone, half step, half tone, halftone, and half-tone are all variously used in sources.
Aaron Copland, Leonard Bernstein, and others use "half tone".
One source says that step is "chiefly US", and that half-tone is "chiefly N. Amer."^{[link removed]}

Semitone, half step, half tone, halftone, and half-tone are all variously used in sources.
Aaron Copland, Leonard Bernstein, and others use "half tone".
One source says that step is "chiefly US", and that half-tone is "chiefly N. Amer."^{[link removed]}