The word proof can mean:

  • originally, a test assessing the validity or quality of something.

  • a rigorous, compelling argument, including:
  • 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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