proof

evidence that makes it certain that something is true

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.

(US) A measure of the alcohol content of liquor. Originally, in Britain, 100 proof was defined as 57.1% by volume (no longer used). In the US, 100 proof means that the alcohol content is 50% of the total volume of the liquid; thus, perfectly pure absolute alcohol would be 200 proof.

An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.

A process for testing the accuracy of an operation performed. Compare prove, transitive verb, 5.

A proof sheet; a trial impression, as from type, taken for correction or examination.

The quality or state of having been proved or tried; firmness or hardness which resists impression, or does not yield to force; impenetrability of physical bodies.

A limited-run high-quality strike of a particular coin, originally as a test run, although nowadays mostly for collectors' sets.

(no longer used) Firmness of mind; stability not to be shaken.

(no longer used) Armour of excellent or tried quality, and deemed impenetrable; properly, armour of proof.

(no longer used) Experience of something.

To allow (yeast-containing dough) to rise, especially after it has been shaped

(informal) To proofread.

To make resistant, especially to water.

To test-fire with a load considerably more powerful than the firearm in question's rated maximum chamber pressure, in order to establish the firearm's ability to withstand pressures well in excess of those expected in service without bursting.

To test the activeness of (yeast).

Firm or successful in resisting.

Being of a certain standard as to alcohol content.

Used in proving or testing.