Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • For a still stronger reason; all the more.

from the GNU version of the Collaborative International Dictionary of English.

  • (Logic & Math.) With stronger reason.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective With stronger or greater reason; as a corollary implied by a stronger claim.
  • adverb With stronger or greater reason; as a corollary implied by a stronger claim.

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

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

Etymologies

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

[Latin ā fortiōrī : ā, from + fortiōrī, ablative of fortior, stronger.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin ā ("from") and fortiōrī, comparative of fortis ("strength").

Examples

    Sorry, no example sentences found.

Comments

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

    February 28, 2009

  • A mediaeval alteration of Classical a fortiore.

    June 3, 2009

  • JM for no reason at all reckons a fortiori

    November 12, 2010