/ Dictionary / Index F fixed-do system: Meaning and Definition of Find definitions for: fixed'-do' sys"tem Pronunciation: (fikst'dō'), [key] — Music. Music. 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. fixed cost fixed-focus camera Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language