/ Dictionary / Index P pentatonic scale: Meaning and Definition of Find definitions for: pen'ta•ton'ic scale' Pronunciation: (pen'tu-ton'ik, pen"-), [key] — Music. Music. 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. pentathlon pentatonism Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language