/ Dictionary / Index D demi-: Meaning and Definition of Find definitions for: demi- Pronunciation: [key] a combining form appearing in loanwords from French meaning “half ” (demilune), “lesser” (demitasse), or sometimes used with a pejorative sense (demimonde); on this model, also prefixed to words of English origin (demigod). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Demetrius I demibastion Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language