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English word proof comes from Latin probus
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probus (Latin)
(morally) upright, honest, virtuous. Good, serviceable, excellent, superior, able.
probatus (Latin)
proba (Late Latin)
prove (Old French)
proof (Middle English)
proof (English)
(US) A measure of the alcohol content of liquor. Originally, in Britain, 100 proof was defined as 57.1% by volume (not used anymore). In the US, 100 proof means that the alcohol content is 50% of the total volume of the liquid, and thus, absolute alcohol would be 200 proof.. (countable) An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a [...]