proof

Reading level: medium

Estimated CEFR level: A2 — Elementary

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun any factual evidence that helps to establish the truth of something
  2. noun a formal series of statements showing that if one thing is true something else necessarily follows from it
  3. noun a measure of alcoholic strength expressed as an integer twice the percentage of alcohol present (by volume)

Etymology

From Middle English proof, from Old French prove, from Late Latin proba (“a proof”), from Latin probō (“to prove”); see prove; compare also the doublet probe.

In classic literature

Synonyms

cogent evidence

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