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tritone

[trahy-tohn] /ˈtraɪˌtoʊn/
noun, Music.
1.
an interval consisting of three whole tones; an augmented fourth.
Origin
1600-1610
1600-10; < Medieval Latin tritonus < Greek trítonos having three tones. See tri-, tone
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tritones

tritone

/ˈtraɪˌtəʊn/
noun
1.
a musical interval consisting of three whole tones; augmented fourth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for tritones

tritone

in music, the interval encompassed by three consecutive whole steps, as for instance the distance from F to B (the whole steps F-G, G-A, and A-B). In semitone notation, the tritone is composed of six semitones; thus it divides the octave symmetrically in equal halves. In musical notation the tritone is written either as an augmented fourth (e.g., F-B or C-F) or as a diminished fifth (e.g., B-F or C-G).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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