Definition of a fortiori in English:

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a fortiori

Pronunciation: /ˌeɪ fɔːtɪˈɔːrʌɪ/
/ˌɑː fɔːtɪˈɔːriː/

adverb& adjective

Used to express a conclusion for which there is stronger evidence than for a previously accepted one: [as adverb]: they reject all absolute ideas of justice, and a fortiori the natural-law position
More example sentences
  • Were it not so, we should have required the a fortiori reasoning for the third degree only.
  • In this way the connexive concept of implication accounts for a necessary presupposition of all conditional and a fortiori logical orientation.
  • What then is the conclusion which in true a fortiori fashion is supposed to follow resoundingly from the weaker premise?


Early 17th century: Latin, from a fortiori argumento 'from stronger argument'.

Words that rhyme with a fortiori

a posteriori, a priori, memento mori, sori, thesauri, tori
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