Semitone (English Wikipedia)

Semitone, half step, half tone, halftone, and half-tone are all variously used in sources.[1][2][3][4][5]
Aaron Copland, Leonard Bernstein, and others use "half tone".[6] [7][8][9]
One source says that step is "chiefly US",[10] and that half-tone is "chiefly N. Amer."[11]

books.google.com (Global: 3^rd place; English: 3^rd place)

Semitone, half step, half tone, halftone, and half-tone are all variously used in sources.[1][2][3][4][5]
Aaron Copland, Leonard Bernstein, and others use "half tone".[6] [7][8][9]
One source says that step is "chiefly US",[10] and that half-tone is "chiefly N. Amer."[11]
Miller, Michael. The Complete Idiot's Guide to Music Theory, 2nd ed. [Indianapolis, Indiana]: Alpha, 2005. ISBN 1-59257-437-8. p. 19.
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.

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)

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.[1][2][3][4][5]
Aaron Copland, Leonard Bernstein, and others use "half tone".[6] [7][8][9]
One source says that step is "chiefly US",[10] and that half-tone is "chiefly N. Amer."[11]

Semitone, half step, half tone, halftone, and half-tone are all variously used in sources.[1][2][3][4][5]
Aaron Copland, Leonard Bernstein, and others use "half tone".[6] [7][8][9]
One source says that step is "chiefly US",[10] and that half-tone is "chiefly N. Amer."[11]

Semitone, half step, half tone, halftone, and half-tone are all variously used in sources.[1][2][3][4][5]
Aaron Copland, Leonard Bernstein, and others use "half tone".[6] [7][8][9]
One source says that step is "chiefly US",[10] and that half-tone is "chiefly N. Amer."[11]