Definitions

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

  • n. Music An interval composed of three whole tones.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An interval of three whole tones.

from the GNU version of the Collaborative International Dictionary of English

  • n. A superfluous or augmented fourth.

from The Century Dictionary and Cyclopedia

  • n. 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.

Etymologies

Medieval Latin tritonus, from Greek tritonos, having three tones : tri-, three; see trei- in Indo-European roots + tonos, tone; see tone.
(American Heritage® Dictionary of the English Language, Fourth Edition)
tri- +‎ tone (Wiktionary)

Examples

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