Meaning of tone row

tone' row"

Pronunciation: [key]
— Music. Music.
  1. a series of tones in which no tone is duplicated, and in which the tones generally recur in fixed sequence, with variations in rhythm and pitch, throughout a composition. Also called note row, twelve-tone row.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.