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proof

1 of 3

noun

ˈprüf How to pronounce proof (audio)
1
a
: the cogency of evidence that compels acceptance by the mind of a truth or a fact
b
: the process or an instance of establishing the validity of a statement especially by derivation from other statements in accordance with principles of reasoning
2
obsolete : experience
3
: something that induces certainty or establishes validity
4
archaic : the quality or state of having been tested or tried
especially : unyielding hardness
5
: evidence operating to determine the finding or judgment of a tribunal
6
a
plural proofs or proof : a copy (as of typeset text) made for examination or correction
b
: a test impression of an engraving, etching, or lithograph
c
: a coin that is struck from a highly polished die on a polished planchet, is not intended for circulation, and sometimes differs in metallic content from coins of identical design struck for circulation
d
: a test photographic print made from a negative
7
: a test applied to articles or substances to determine whether they are of standard or satisfactory quality
8
a
: the minimum alcoholic strength of proof spirit
b
: strength with reference to the standard for proof spirit
specifically : alcoholic strength indicated by a number that is twice the percent by volume of alcohol present
whiskey of 90 proof is 45 percent alcohol

proof

2 of 3

adjective

1
: able to resist or repel
boots that were … proof against cold and wet Robertson Davies
—often used in combination
windproof
2
: used in proving or testing or as a standard of comparison
3
: of standard strength or quality or alcoholic content

proof

3 of 3

verb

proofed; proofing; proofs

transitive verb

1
a
: to make or take a proof or test of
b
: proofread
2
: to give a resistant quality to
3
: to activate (yeast) by mixing with water and sometimes sugar or milk
proofer noun

Synonyms

Noun

Example Sentences

Noun The document was proof that her story was true. He claims that he was home when the murder was committed, but he has no proof. The proof shows that the theorem is true. Verb She proofed the story carefully.
Recent Examples on the Web
Noun
Based on the latest local guidelines, attendees are no longer required to provide proof of negative COVID-19 test and/or vaccination for entry into this event. Amanda Kondolojy, Orlando Sentinel, 15 Sep. 2022 State law requires parents to provide proof of student immunization status no later than the first day of school. Carole Carlson, Chicago Tribune, 3 Sep. 2022 Responding officers located the vehicle and the woman and took the bike until the girl and her parents could provide proof of ownership. cleveland, 31 Aug. 2022 The department declined to explain how someone would provide proof of an unborn child, or what should happen in the event a woman miscarries after claiming the exemption. Laura Kusisto, WSJ, 27 Aug. 2022 Masks required, and all patrons must provide proof of COVID-19 vaccination, with the final shot taken at least 14 days prior. Piet Levy, Journal Sentinel, 24 Aug. 2022 In addition, participants over the age of 12 must provide proof of vaccination against COVID-19 before entering any indoor park facility. Adam Sabes, Fox News, 21 Aug. 2022 Presumptive owners will have to provide proof of ownership before taking the dog home with them, the nonprofit told KHOU. Michael Murney, Chron, 18 Aug. 2022 It’s these similarities which scientists believe provide proof the birth of the Moon was fueled by debris from Earth. Joshua Hawkins, BGR, 14 Aug. 2022
Adjective
On the other hand, chairs that are intended for trails should be weather-resistant and rip-proof in case your pets are tagging along for the ride. Alyssa Brascia, Peoplemag, 18 Sep. 2022 The police agency also proposed bullet-proof shields that are not yet used in Japan, a country known for strict gun control. Mari Yamaguchi, Anchorage Daily News, 25 Aug. 2022 Plus, Haus Labs and Urban Decay both launched a similar budge-proof glossy lipstick that reminds us of another product that, at the very least, Lady Gaga is familiar with. Kirbie Johnson, refinery29.com, 25 Aug. 2022 Treat your outdoor room like an indoor living room: Outfit it with comfy, yet weather-proof furniture and fun adornments, like quirky light fixtures or colorful pillows. Caitlin Sole, Better Homes & Gardens, 23 Aug. 2022 So, putting that all together: The Inflation Reduction Act nudges consumers toward a more climate-proof American home, which is first of all better insulated to keep heat or cold either in or out. Wired, 18 Aug. 2022 Webster wore a bullet-proof vest during the riot, which increased the sentencing guidelines by 6 years, Mehta said. Bart Jansen, USA TODAY, 1 Sep. 2022 Congress can also end emergencies, but doing so effectively requires a veto-proof two-thirds vote, which has never happened. Will Weissert, ajc, 13 Aug. 2022 With a weather-proof pouch and 1.5-inch-wide collar that uses Uncharted’s secure and quick Fidlock attachment system, this lightweight collar is both functional and easy to use. Steve Larese, Outside Online, 10 Aug. 2022
Verb
Contentious, perhaps, but not proof that his editors were trying to protect the university from damaging stories. Cara Fitzpatrick, Washington Post, 19 Aug. 2022 Critter-proof your campsite by keeping it clean and properly stashing food and scented products, such as toothpaste, in lockers, which are provided at many sites and are especially crucial in bear country. Erin E. Williams, BostonGlobe.com, 10 July 2022 In terms of improvements to wellbeing and retention, this can be seen as a way to future-proof your organization. Rodger Dean Duncan, Forbes, 2 Aug. 2022 But Sharma warns that companies shouldn’t sacrifice strategic initiatives meant to future-proof their business in an effort to cut costs in the short-term. Paolo Confino, Fortune, 25 July 2022 Here are three ways to recession-proof your value proposition. Jim Berryhill, Forbes, 17 Aug. 2022 In addition to gender-lensing policy decisions, our leaders should also future-proof our economy by creating laws to increase women’s economic equity. Katica Roy, Fortune, 4 Aug. 2022 Critter-proof your campsite by keeping it clean and properly stashing food and scented products, such as toothpaste, in lockers, which are provided at many sites and are especially crucial in bear country. Erin E. Williams, BostonGlobe.com, 10 July 2022 Critter-proof your campsite by keeping it clean and properly stashing food and scented products, such as toothpaste, in lockers, which are provided at many sites and are especially crucial in bear country. Erin E. Williams, BostonGlobe.com, 10 July 2022 See More

Word History

Etymology

Noun

Middle English prof, prove, alteration of preve, from Anglo-French preove, from Late Latin proba, from Latin probare to prove — more at prove

First Known Use

Noun

13th century, in the meaning defined at sense 1a

Adjective

1583, in the meaning defined at sense 1

Verb

circa 1699, in the meaning defined at sense 1a

Time Traveler
The first known use of proof was in the 13th century

Phrases Containing proof

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