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definition of the word proof

by the Wiktionnary

Wikipedia has an article on:
Proof

Wikipedia

< Middle English proof < Old French prove < Late Latin proba (a proof) < Latin probare (to prove); see prove.

Singular
proof

Plural
proofs

proof (plural proofs)

  1. Any effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.
  2. The degree of evidence which convinces the mind of any truth or fact, and produces belief; a test by facts or arguments which induce, or tend to induce, certainty of the judgment; conclusive evidence; demonstration.
  3. The quality or state of having been proved or tried; firmness or hardness which resists impression, or doesn't yield to force; impenetrability of physical bodies.
  4. Firmness of mind; stability not to be shaken.
  5. (printing) A proof sheet; a trial impression, as from type, taken for correction or examination.
  6. (mathematics): A process for testing the accuracy of an operation performed. Compare prove, transitive verb, 5.
  7. (obsolete): Armour of excellent or tried quality, and deemed impenetrable; properly, armour of proof.
  8. (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.


Definition from Wiktionary
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