1. Any factual evidence that helps to establish the truth of something
   "if you have any proof for what you say, now is the time to produce it";
   - cogent evidence
    
2. (logic) a formal series of statements showing that if one thing is true something else necessarily follows from it
   "The mathematician presented a rigorous proof of the theorem"
    
3. The act of validating; finding or testing the truth of something
   "The proof of the theorem took years to complete";
   - validation, substantiation
    
4. (printing) an impression made to check for errors
   "The printer ran a proof to ensure the colours were correct";
   - test copy, trial impression
    
5. A trial photographic print from a negative
   "The photographer examined the proof before ordering the final prints"
    
6. A measure of alcoholic strength expressed as an integer twice the percentage of alcohol present (by volume)
   "The whiskey was 100 proof, meaning it contained 50% alcohol"

1. (used in combination or as a suffix) able to withstand
   "temptation-proof"

1. Make resistant (to harm)
   "proof the materials against shrinking in the dryer"
    
2. Check text for errors
   "I should proof my manuscripts";
   - proofread
    
3. Make or take a proof of, such as a photographic negative, an etching, or typeset
   "The editor proofed the final layout before sending it to print"
    
4. Activate by mixing with water and sometimes sugar or milk
   "proof yeast"
    
5. Knead to reach proper lightness
   "proof dough"

Derived forms: proofing, proofs, proofed

See also: imperviable, impervious

Type of: alter, amount, argument, ascertain, change, check, create, determination, ensure, evidence, finding, grounds, impression, insure, knead, make, make certain, make sure, measure, modify, photographic print, print, printing, produce, quantity, see, statement, strengthen, toughen, work

Encyclopedia: Proof