Meaning of a fortiori in English:

a fortiori

Pronunciation /ˌeɪ ˌfɔːtɪˈɔːrʌɪ/

adverb

  • Used to express a conclusion for which there is stronger evidence than for a previously accepted one.

    • ‘they reject all absolute ideas of justice, and a fortiori the natural law position’

adjective

  • Denoting or based on a conclusion for which there is stronger evidence than for a previously accepted one.

    ‘the a fortiori argument is not entirely refuted’
    • ‘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?’
    • ‘That's an argument a fortiori: If something less likely is true, then something more likely will probably be true as well.’
    • ‘There is a fortiori no meaningful content to the ‘proposition’ that such a distance has changed and still more so no meaningful content to the ‘proposition’ that such a distance is changing either at a uniform or at a non-uniform rate’

Origin

Early 17th century Latin, from a fortiori argumento ‘from stronger argument’.