a fortiori
adverb/ˌeɪ ˌfɔːtiˈɔːraɪ/
/ˌɑː ˌfɔːrtiˈɔːri/
(formal or law, from Latin)- for or with an even stronger reason
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a fortiori
Definition of a fortiori adverb from the Oxford Advanced Learner's Dictionary