(countable) An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.
* 1591 , ,
''Humorous Poems ,
- But the false Fox most kindly played his part,
- For whatsoever mother-wit or art
- Could work he put in proof . No practice sly,
- No counterpoint of cunning policy,
- No reach, no breach, that might him profit bring.
* c. 1633 , , Act 1, Scene 1,
- But he the same did to his purpose wring.
- France I more praise and love; you are, my lord,
- Yourself for horsemanship much famed; and there
* 1831 , , A System of Chemistry of Inorganic Bodies , Volume 2,
- You shall have many proofs to shew your skill.
(uncountable) The degree of evidence which convinces the mind of any truth or fact, and produces belief; a test by facts or arguments which induce, or tend to induce, certainty of the judgment; conclusive evidence; demonstration.
* c.1603 , ,
- A given quantity of the spirits was poured upon a quantity of gunpowder in a dish and set on fire. If at the end of the combustion, the gunpowder continued dry enough, it took fire and exploded; but if it had been wetted by the water in the spirits, the flame of the alcohol went out without setting the powder on fire. This was called the proof .
* 1841 , '' in ''Essays: First Series ,
- I'll have some proof .
* 1990 October 16, ,
- It was a grand sentence of Emanuel Swedenborg, which would alone indicate the greatness of that man's perception, — "It is no proof of a man's understanding to be able to confirm whatever he pleases; but to be able to discern that what is true is true, and that what is false is false, this is the mark and character of intelligence."
- Faith, faith is an island in the setting sun
- But proof , yes
The quality or state of having been proved or tried; firmness or hardness which resists impression, or doesn't yield to force; impenetrability of physical bodies.
(obsolete) Experience of something.
* 1590 , (Edmund Spenser), The Faerie Queene , III.1:
- Proof is the bottom line for everyone
(uncountable, obsolete) Firmness of mind; stability not to be shaken.
(countable, printing) A proof sheet; a trial impression, as from type, taken for correction or examination.
(countable, logic, mathematics) A sequence of statements consisting of axioms, assumptions, statements already demonstrated in another proof, and statements that logically follow from previous statements in the sequence, and which concludes with a statement that is the object of the proof.
(countable, mathematics) A process for testing the accuracy of an operation performed. Compare prove, transitive verb , 5.
(obsolete) Armour of excellent or tried quality, and deemed impenetrable; properly, armour of proof.
- But the chaste damzell, that had never priefe / Of such malengine and fine forgerye, / Did easely beleeve her strong extremitye.
(US) A measure of the alcohol content of liquor. Originally, in Britain, 100 proof' was defined as 57.1% by volume (not used anymore). In the US, 100 '''proof''' means that the alcohol content is 50% of the total volume of the liquid, and thus, absolute alcohol would be 200 ' proof .
* artist's proof
* burden of proof
* conditional proof
* proof reader
* proof of concept
Used in proving or testing.
Firm or successful in resisting.
- a proof''' load''; ''a '''proof charge
- proof against harm
* 1671 , '', 1820, Dr Aiken (biographies), ''Select Works of the British Poets ,
- water'''proof'''''; '''''bombproof .
* 1790 , , Reflections on the Revolution in France'', 1803, ''The Works of The Right Honourable Edmund Burke , Volume 5,
- And opportunity I here have had / To try thee, sift thee, and confess have found thee / Proof against all temptation as a rock / Of adamant, and, as a centre, firm :
(of alcoholic liquors) Being of a certain standard as to alcohol content.
- This was a good, ?tout proof article of faith, pronounced under an anathema, by the venerable fathers of this philo?ophick ?ynod.
(lb) To make resistant, especially to water.
To allow to rise (of yeast-containing dough).
To test the activeness of (yeast).
Lacking a definition or value.
(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
- The result of division by zero is undefined .