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1. Half: demirelief.
2. To some degree; part; partly: demigod.
[Middle English demi, a half of a measure or unit, from Old French, from Medieval Latin dīmedius, from Latin dīmidius, divided in half : dis-, dis- + medius, half; see medium.]
2. of less than full size, status, or rank: demigod.
[via French from Medieval Latin dīmedius, from Latin dīmīdius half, from dis- apart + medius middle]
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).
[< French, comb. form representing demi < Vulgar Latin *dīmedius, for Latin dīmidius half =dī- di-2 + medius middle]