Latin

A Fortiori

ay for-tee-OR-ee
A Latin term meaning "from the stronger" or "with stronger reason." It's a legal principle used to draw a conclusion that is even more certain than another conclusion that has already been accepted.
If it is illegal to drive under the influence of alcohol, then a fortiori, it is illegal to drive under the influence of both alcohol and drugs.
Richmond v. J.A. Croson Co. (1989): U.S. Supreme Court held that federal government's power to address societal discrimination did not automatically mean that states and local governments had the same broad power.
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Frequently Asked Questions

A fortiori is based on a previous conclusion or argument, while a priori reasoning is based on theoretical deduction rather than empirical evidence.

Yes, by demonstrating that the second conclusion does not logically follow from the first or by questioning the validity of the initial conclusion itself.

While commonly used in legal arguments, a fortiori reasoning can be applied in other fields like philosophy, mathematics, and everyday reasoning.

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