a fortiori - definition and synonyms

adjective, adverb legal 

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/ˌeɪ fɔː(r)tiˈɔːraɪ/
  1. used for saying that something that is true for one case is even more true in another case

    If this was the interpretation of the term in the 1916 Act, there is, a fortiori, no reason why it should not be similarly construed in the 1968 Act.

Word story
From a Latin expression meaning ‘for an even stronger reason’.