Definitions

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

  • adv. For a still stronger reason; all the more.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. With stronger or greater reason; as a corollary implied by a stronger claim.
  • adv. With stronger or greater reason; as a corollary implied by a stronger claim.

from the GNU version of the Collaborative International Dictionary of English

  • With stronger reason.

from The Century Dictionary and Cyclopedia

  • For a still stronger reason; all the more.

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

  • adv. with greater reason; for a still stronger, more certain reason

Etymologies

Latin : ā, ab, from + fortiōrī, ablative of fortior, stronger.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin ā ("from") and fortiōrī, comparative of fortis ("strength"). (Wiktionary)

Examples

Sorry, no example sentences found.

Wordnik is becoming a not-for-profit! Read our announcement here.

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.

  • JM for no reason at all reckons a fortiori

    November 12, 2010

  • A mediaeval alteration of Classical a fortiore.

    June 3, 2009

  • An A fortiori argument is one that "denotes a proof of a claim by means of an already proved stronger claim."

    February 28, 2009