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Legal Definition and Related Resources of A Fortiori

A Fortiori Alternative Definition

By (or from) the stronger reason. Applied to the argument that, because of the concession or establishment of a given proposition, another included in it is by the greater reason true.

Related Entries of A Fortiori in the Encyclopedia of Law Project

Browse or run a search for A Fortiori in the American Encyclopedia of Law, the Asian Encyclopedia of Law, the European Encyclopedia of Law, the UK Encyclopedia of Law or the Latin American and Spanish Encyclopedia of Law.

A Fortiori in Historical Law

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What does A fortiori mean in American Law?

The definition of A fortiori in the law of the United States, as defined by the lexicographer Arthur Leff in his legal dictionary is:

“Even stronger” or “even more so.” The term, and a fortiori the concept for which it stands, is very widely used in legal reasoning. For it represents one species of the argumentative move by which one manages to get someone else to accept a more extreme position than the one needed for the job of persuasion at hand, and then shows him that if he is willing to go that far, surely he is willing to go less far. For example, “So you accept the fact that he’s entitled to defend himself from threatened injury? Then a fortiori he’s entitled to defend himself from threatened death.” To put it another way, if you can get someone to agree with you about any particular point on the slippery slope, everything downhill from there is an “a fortiori case.”


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This definition of A Fortiori Is based on the The Cyclopedic Law Dictionary . This entry needs to be proofread.

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Meaning of A Fortiori


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  • A Multo Fortiori

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    (2018, 04). A fortiori Retrieved 12, 2022, from

    04 2018. 12 2022 <>

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    "A fortiori" 04, 2018. Accesed 12 2022.

    Asian Law, 'A fortiori' ( 2018) <> accesed 2022 December 4

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    Schema Summary

    • Article Name: A fortiori
    • Author: Asian Law
    • Description: More so; with stronger reason

    This entry was last updated: April 1, 2018


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