A Quick and Simple Dictionary

proof

1. Noun.  (countable) An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.
2. Noun.  (uncountable) 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. Noun.  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. Noun.  (uncountable, obsolete) Firmness of mind; stability not to be shaken.
5. Noun.  (countable, printing) A proof sheet; a trial impression, as from type, taken for correction or examination.
6. Noun.  (countable, logic) A sequence of statements consisting of axioms, assumptions, statements already demonstrated in another proof, and statements that logically follow from previous statements in the sequence, and which concludes with a statement that is the object of the proof.
7. Noun.  (countable, mathematics) A process for testing the accuracy of an operation performed. Compare prove, ''transitive verb'', 5.
8. Noun.  (obsolete) Armour of excellent or tried quality, and deemed impenetrable; properly, armour of proof.
9. Noun.  (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'''.
10. Adjective.  Used in proving or testing.
11. Adjective.  Firm or successful in resisting.
12. Adjective.  (context, of alcoholic liquors) Being of a certain standard as to alcohol content.
13. Verb.  (transitive, intransitive) To proofread.
14. Verb.  (transitive) To make resistant, especially to water.
15. Verb.  (transitive) To knead, as in bread dough.