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

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.

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.

To proofread.

To make resistant, especially to water.

To allow yeast-containing dough to rise.

Used in proving or testing.

“a proof load; a proof charge”

Firm or successful in resisting.

“proof against harm”

(of alcoholic liquors) Being of a certain standard as to alcohol content.