Evidence or argument establishing a fact or the truth of a statement. The lawyer presented proof of the defendant's innocence.
A trial impression of a page, taken from type or film and used for making corrections before final printing. The editor reviewed the proof to ensure there were no errors before the book went to print.
A test or trial of something to establish its quality, performance, or reliability. The prototype underwent exhaustive proof before the product launch.
A measure of the strength of an alcoholic beverage, expressed as twice the percentage of alcohol present. The whiskey was labeled as 80 proof, indicating it contained 40% alcohol.
(mathematics, logic) A sequence of logical deductions establishing the truth of a theorem or proposition. The professor sketched a proof of the theorem on the board.
To make something resistant to a particular effect or condition. They proofed the deck so that it would resist rot and insects.
To read and correct a piece of written or printed material. She proofed the article for any grammatical mistakes before it was published.
To activate yeast by mixing it with water and sugar to start fermentation. Before baking, you need to proof the yeast to ensure it is active.
(intransitive) To rise as a result of fermentation, said of bread dough. The dough needs to proof for at least an hour before baking.