(noun, adjective, verb)


1. (used in combination or as a suffix) able to withstand

- temptation-proof

- childproof locks

Similar word(s): imperviable, impervious

Sentences with proof as an adjective:

- a proof load; a proof charge

- proof against harm

- waterproof; bombproof.


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

Definition categories: thought, evidence, grounds

2. a formal series of statements showing that if one thing is true something else necessarily follows from it

Definition categories: communication, argument, statement

3. a measure of alcoholic strength expressed as an integer twice the percentage of alcohol present (by volume)

Definition categories: quantity, amount, measure

4. (printing) an impression made to check for errors

Definition categories: communication, impression, printing

5. a trial photographic print from a negative

Definition categories: man–made, print

6. the act of validating; finding or testing the truth of something

Similar word(s): substantiation, validation

Definition categories: act, determination, finding


1. make or take a proof of, such as a photographic negative, an etching, or typeset

Definition categories: creation, create, make, produce

2. knead to reach proper lightness

- proof dough

Definition categories: contact, knead, work

3. read for errors

- I should proofread my manuscripts

Similar word(s): proofread

Definition categories: cognition, ascertain, assure, check, control, ensure, insure, see

4. activate by mixing with water and sometimes sugar or milk

- proof yeast

Definition categories: change, alter, modify

5. make resistant (to harm)

- proof the materials against shrinking in the dryer

Definition categories: change, strengthen