[ proof ]
/ pruf /



verb (used with object)

Origin of proof

1175–1225; Middle English prove, prooff, prof, proufe, alteration (by association with the vowel of prove) of preove, proeve, prieve, pref < Middle French preve, proeve, prueve < Late Latin proba a test, akin to Latin probāre to test and find good; cf. pree


re-proof, verb (used with object)un·proofed, adjective

synonym study for proof

1. See evidence.

historical usage of proof

Proof entered English in the 12th century as Middle English prove, prooff, prof, proufe, with the meaning “evidence sufficient to establish a thing as true.” It finds its roots in Late Latin proba, meaning "a test." An example of proof meaning “test” is in the English proverb “All the proof of a pudding is in the eating,” first recorded in English in 1605. The proverb is popularly but wrongly attributed to Miguel Cervantes. In the second part of Cervantes’ Don Quixote (published in 1615), Cervantes wrote “Por la muestra se conoce el paño,” literally, “From the sample you know the cloth,” which was translated into English as “The proof of a pudding is in the eating” by Peter Anthony Motteux, a French-born English playwright and translator, in his English translation (third edition 1712). We know this today as the saying “The proof is in the pudding.” Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for proofer

/ (pruːf) /




Word Origin for proof

C13: from Old French preuve a test, from Late Latin proba, from Latin probāre to test
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for proofer

[ prōōf ]

A demonstration of the truth of a mathematical or logical statement, based on axioms and theorems derived from those axioms.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.