General English

  • noun a thing which proves or which shows that something is true
  • suffix
    (written as -proof)
    which prevents something getting in, getting out or harming

General Science

  • noun the series of logical stages used to establish whether a mathematical or philosophical proposition is valid


  • suffix
    (written as -proof)
    protected from the negative effect of something


  • noun the relative strength of an alcoholic drink expressed by a number that is twice the percentage of the alcohol present in the liquid

Information & Library Science

  • noun facts or evidence to show that something is true
  • noun a sample printed page made from type, for approval before mass printing
  • suffix
    (written as -proof)
    added to nouns to show that something cannot be damaged


  • noun the statement or evidence of a creditor to show that he or she is owed money by a bankrupt or by a company in liquidation

Media Studies

  • noun a printout of the page layout of material to be printed, including copy, pictures, advertisements etc., made available for checking and correction before final printing


  • verb to make proofs of a text


  • adjective having a particular alcoholic strength that is expressed by a proof number

Origin & History of “proof”

Proof and prove are of course closely related. both go back ultimately to Latin probāre ‘test, prove’. from this in post-classical times was derived the noun proba ‘proof’, which passed into English via Old French preve as pref. In the 14th and 15th centuries this gradually changed in the mainstream language to proof, due to the influence of the verb prove.