Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Describing a mode or scale that has seven pitches in an octave

from The Century Dictionary and Cyclopedia

  • In music, consisting of seven tones to the octave: said of scales: often contrasted with pentatonic.

Etymologies

hepta- +‎ tonic (Wiktionary)

Examples

  • Now, with my own lips, I have played notes from Subterranean flutes twenty-five thousand years old standard diatonic to heptatonic, including a flatted la and a neutral third for mi, i.e., a blue note.

    Deeper

  • We have already remarked that the current medieval theory laid down for the tone system a heptatonic diatonic scale of about two octaves with the addition of b flat in the higher octave.

    The Catholic Encyclopedia, Volume 12: Philip II-Reuss

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