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Meaning of pentatonic scale

pen'ta•ton'ic scale'

Pronunciation: (pen'tu-ton'ik, pen"-), [key]
— Music. Music.
  1. a scale having five tones to an octave, as one having intervals that correspond to the five black keys of a piano octave.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.