Definition of "demi" in English

noun

1. Alternative spelling of demy.

2. (slang) A fifty pence piece.

3. A bottle of wine containing 0.375 liters of fluid, half the volume of a standard bottle; a split.

4. A small glass used chiefly in France (especially for beer) holding 250 milliliters.

noun

1. A member of the demimonde; a woman maintained by a wealthy man.

adjective

1. (informal) Demisexual.