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Meaning of fixed-do system

fixed'-do' sys"tem

Pronunciation: (fikst'dō'), [key]
— Music. Music.
  1. a system of solmization in which the syllable do is always C, regardless of the key. Cf. movable-do system.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.