Definition of a fortiori in English:

a fortiori

adjective & adverb

  • 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’

Origin

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

Pronunciation:

a fortiori

/ˌeɪ fɔːtɪˈɔːrʌɪ//ˌɑː fɔːtɪˈɔːriː/