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 alcohol is in a beverage
Proof, a play by David Auburn
Proof, a film by Jocelyn Moorhouse
a Proof coin is a coin made especially for coin collectors, usually distinguished by being struck twice (or at a higher pressure) and often with polished fields and frosted devices.

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