proof

1. proof (noun) — sense 1

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

Example: I need proof of your unconditional love. Lend me some dough.

2. proof (noun) — sense 2

Definition: 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.

Example: I'll have some proof.

3. proof (noun) — sense 3

Definition: 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.

4. proof (adj) — sense 4

Definition: Used in proving or testing.

Example: a proof load; a proof charge

5. proof (adj) — sense 5

Definition: Firm or successful in resisting.

Example: proof against harm

6. proof (adj) — sense 6

Definition: Being of a certain standard as to alcohol content.

Example: 60% proof liquor

7. proof (verb) — sense 7

Definition: To proofread.

8. proof (verb) — sense 8

Definition: To make resistant, especially to water.

9. proof (verb) — sense 9

Definition: 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.