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English word proof comes from Latin probus
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 [...]