/ Dictionary / Index C code flag: Meaning and Definition of Find definitions for: code' flag" Pronunciation: [key] — Naut. Naut. a flag forming part of a signal code. a flag indicating that a certain signal code is being used. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. codefendant codeine Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language