Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An interval composed of three whole tones.

from The Century Dictionary.

  • noun In music, an interval composed of three whole steps or “tones”—that is, an augmented fourth, as between the fourth and seventh tones of a scale.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Mus.), rare A superfluous or augmented fourth.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun music An interval of three whole tones.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Medieval Latin tritonus, from Greek tritonos, having three tones : tri-, three; see trei- in Indo-European roots + tonos, tone; see tone.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

tri- +‎ tone

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