proof spirit(redirected from Proof (alcohol))
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1. (in Britain and Canada) a mixture of alcohol and water or an alcoholic beverage that contains 49.28 per cent of alcohol by weight, 57.1 per cent by volume at 51°F: up until 1980 used as a standard of alcoholic liquids
2. (in the US) a similar standard mixture containing 50 per cent of alcohol by volume at 60°F