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1. The evidence or argument that compels the mind to accept an assertion as true.
a. The validation of a proposition by application of specified rules, as of induction or deduction, to assumptions, axioms, and sequentially derived conclusions.
b. A statement or argument used in such a validation.
a. Convincing or persuasive demonstration: was asked for proof of his identity; an employment history that was proof of her dependability.
b. The state of being convinced or persuaded by consideration of evidence.
4. Determination of the quality of something by testing; trial: put one's beliefs to the proof.
5. Law
a. The establishment of the truth or falsity of an allegation by evidence.
b. The evidence offered in support of or in contravention of an allegation.
6. The alcoholic strength of a liquor, expressed by a number that is twice the percentage by volume of alcohol present.
7. Printing
a. A trial sheet of printed material that is made to be checked and corrected. Also called proof sheet.
b. A trial impression of a plate, stone, or block taken at any of various stages in engraving.
a. A trial photographic print.
b. Any of a limited number of newly minted coins or medals struck as specimens and for collectors from a new die on a polished planchet.
9. Archaic Proven impenetrability: "I was clothed in Armor of proof" (John Bunyan).
1. Fully or successfully resistant; impervious. Often used in combination: waterproof watches; a fireproof cellar door.
2. Of standard alcoholic strength: proof liquor.
3. Used to proofread or correct typeset copy: a proof copy of the manuscript.
v. proofed, proof·ing, proofs
1. Printing
a. To make a trial impression of (printed or engraved matter).
b. To proofread (copy).
a. To activate (dormant dry yeast) by adding water.
b. To work (dough) into proper lightness.
3. To treat so as to make resistant: proof a fabric against shrinkage.
1. Printing To proofread.
2. To become properly light for cooking: The batter proofed overnight.

[Middle English prove, preve, from Anglo-Norman prove and from Old French prueve, both from Late Latin proba, from Latin probāre, to prove; see prove.]

proof′er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


The verification that a breached lane is free of live mines by passing a mine roller or other mine-resistant vehicle through as the lead vehicle.
Dictionary of Military and Associated Terms. US Department of Defense 2005.
References in periodicals archive ?
Holland Damp Proofing UK Ltd's most popular method of keeping walls dry is a system made of hollow stone elements.
If you don't devote enough attention to proofing, how do you explain to your readers that what you really meant to write was "six million" instead of "sex million"?
GMG has announced the launch of a proofing system comprising of Canon's brand-new image PROGRAF iPF8300/iPF6350/iPF6300 inkjet printers, and supported by GMG ColorProof, GMG FlexoProof XG and GMG DotProof XG contone and halftone proofing systems.
APR's DL[P.sup.3] System combines the EFI Colorproof XF proofing system, an Epson 4880 Inkjet printer and the Allen Datagraph Systems Digital Finishing System (an all-in-one digital proofer, digital press and digital converter solution).
The Graphic Communications Department of Clemson University, located in Clemson, SC, USA, will conduct two day-and-a-half seminars in May on the subject of digital proofing for flexography.
Everyone who is familiar with the prepress proofing aspect of the printing business has probably heard a tale of the print salesperson who meets his client in the local adult-beverage lounge.
Because you are caught in the nightmare of rushing through a job in order to meet the press schedule and the task of final proofing is tossed out the window.
Anderson & Vreeland Inc., of Bryan, OH, a manufacturer and distributor of flexographic printing materials and equipment, has been appointed distributor of Latran Technologies' Prediction Digital Halftone Proofing Systems.
An agreement between DuPont Imaging Technologies and System Brunner of Switzerland is intended to enhance the accuracy of Eurostandard Cromalin contract proofing for offset printing.
The new Veris proofer is a four-page, tabletop proofing system that uses a new Creo technology, Multi-Drop Array inkjet, for high image quality and consistency.
In addition, many established commercial services are now incorporating blockchain proofing. For instance, DocuSign offers the ability to write a proof of the DocuSign document to the Ethereum blockchain.