Definition from Wiktionary, the free dictionary
- With stronger or greater reason; as a corollary implied by a stronger claim.
1954, Gilbert Ryle, “dilemma vii: Perception”, in Dilemmas: The Tarner Lectures, 1953, The Syndics of the Cambridge University Press, page 103:
- Now starting and stopping cannot themselves have starts or stops, or, a fortiori, middles either.
2011, Mortimer Jerome Adler, How to Prove There Is a God:
- We're bound to accept an a fortiori claim because of our prior acceptance of a weaker application of the same reasoning. Frank can't run to the store in less than five minutes, and the restaurant is several blocks further away than the store. Thus, a fortiori, Frank can't run to the restaurant in less than five minutes.