1a : the cogency of evidence that compels acceptance by the mind of a truth or a fact

b : the process or an instance of establishing the validity of a statement especially by derivation from other statements in accordance with principles of reasoning

3 : something that induces certainty or establishes validity

4 archaic : the quality or state of having been tested or tried especially : unyielding hardness

5 : evidence operating to determine the finding or judgment of a tribunal

6a plural proofs or proof : a copy (as of typeset text) made for examination or correction

b : a test impression of an engraving, etching, or lithograph

c : a coin that is struck from a highly polished die on a polished planchet, is not intended for circulation, and sometimes differs in metallic content from coins of identical design struck for circulation

d : a test photographic print made from a negative

7 : a test applied to articles or substances to determine whether they are of standard or satisfactory quality

@StudentOfDrA You can't help the herd. I know, some FEW of you will say I was helped. Great. That does NOT mean I helped the masses it means you were never a part of the masses. Utterly doomed and proof is how the hero has been made the villain. But

— Animal Welfare 24/7 (@SteamPoweredDM) Mar 10, 2022

8a : the minimum alcoholic strength of proof spirit

b : strength with reference to the standard for proof spirit specifically : alcoholic strength indicated by a number that is twice the percent by volume of alcohol present whiskey of 90 proof is 45 percent alcohol

1 : able to resist or repel boots that were … proof against cold and wet— Robertson Davies —often used in combination windproof

2 : used in proving or testing or as a standard of comparison

3 : of standard strength or quality or alcoholic content

1a : to make or take a proof or test of

2 : to give a resistant quality to

3 : to activate (yeast) by mixing with water and sometimes sugar or milk