/ Dictionary / Index M morpheme structure condition: Meaning and Definition of Find definitions for: mor'pheme struc"ture condi"tion Pronunciation: [key] (in generative phonology) a constraint on the occurrence of sounds or sequences of sounds in the phonological representation of morphemes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. morpheme morphemics Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language