Proof

The word proof can mean:

originally, a test assessing the validity or quality of something.
a rigorous, compelling argument, including:
- a logical argument or a mathematical proof (see also proof theory).
- a legal proof.
- a large accumulation of scientific evidence.
a photograph, print or page layout presented as an example for proofreading or approval.
alcoholic proof, a measure of how much ethanol is in an alcoholic beverage.
proof coinage, a coin made as an example of a particular strike.
Proof, a play by David Auburn.
Proof, a film by Jocelyn Moorhouse.
Proof, a rapper and member of the group D12.

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