Proof

The word proof can mean:

1. 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
2. a photograph, print or page layout[?] presented as an example for proofreading or approval
3. alcoholic proof, a measure of how much alcohol is in a beverage
4. Proof, a play by David Auburn[?]

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