from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To affirm positively; declare.
  • transitive v. Law To assert formally as a fact.
  • transitive v. Law To justify or prove.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Possessions, property, belongings, wealth.
  • n. A work-horse, working ox, or other beast of burden.
  • v. To assert the truth of, to affirm with confidence; to declare in a positive manner.
  • v. To prove or justify a plea.
  • v. To avouch, prove, or verify; to offer to verify.

from the GNU version of the Collaborative International Dictionary of English

  • n. A work horse, or working ox.
  • transitive v. To assert, or prove, the truth of.
  • transitive v. To avouch or verify; to offer to verify; to prove or justify. See Averment.
  • transitive v. To affirm with confidence; to declare in a positive manner, as in confidence of asserting the truth.

from The Century Dictionary and Cyclopedia

  • To assert the truth of.
  • To confirm; verify; prove to be true.
  • To affirm with confidence; declare in a positive or peremptory manner.
  • In law, to avouch or verify; offer to verify; allege as a fact.
  • To assert the existence of; offer in evidence.
  • Synonyms Affirm, Declare, etc. (see assert), say, allege, protest, insist, maintain.
  • n. Substance; property; estate.
  • n. plural Live stock; cattle; domestic animals.—
  • n. A beast of burden; a draft-ox or draft-horse; an old horse.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. to declare or affirm solemnly and formally as true
  • v. report or maintain


Middle English averren, from Old French averer, from Vulgar Latin *advērāre : Latin ad-, ad- + Latin vērus, true.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Old French aveir (French avoir), substantive use of the verb, from Latin habēre, present active infinitive of habeō ("I have, hold, keep"). (Wiktionary)
From French avérer, from Late Latin *advērāre, from ad + vērus ("true"). (Wiktionary)



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  • Mmmm, frowning dictionaries.

    June 2, 2010

    As Coroner, I must aver
    I thoroughly examined her.
    And she's not only merely dead,
    She's really, most sincerely dead.

    June 2, 2010

  • This turns up in some old compound forms: aver-silver, averpenny, aver-corn, averland. The O.E.D. quotes sources that associate it with average in this context, but frowns at their 'very doubtful value'.

    January 11, 2009