Definition of "demi"

demi

noun
plural demis
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 mililiters.
  Quotations
  The place was empty save for a big man who was sitting opposite drinking a demi of dark beer.
  1928, Jean Rhys, Quartet, Penguin, published 2000, page 34
  A croque-monsieur will set you back €6, a steak €12.50, and a demi of Stella €3.
  2012, Time Out Paris, London: Time Out Guides, page 234
adjective
comparative more demi, superlative most demi
1. (informal) Demisexual.
  Quotations
  “[...] I totally think she's demi.” “What?” “Demisexual? She only likes fucking people she's in love with, whereas I,” Maddie said, moving closer to Jordan, “like fucking anything and anyone. Everyone has such hang-ups about sex, it's like pathetic, you know? We are just, like, totally animals after all, evolved monkeys. I'm all for giving in to my primal instincts.”
  2017, Tayari Jones, Atlanta Noir