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Meaning of movable-do system

mov'a•ble-do' sys"tem

Pronunciation: (m'vu-bul-dō'), [key]
— Music. Music.
  1. a system of solmization in which the syllable do can be transposed to the tonic of any key. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.