Definition of a fortiori adverb from the Oxford Advanced Learner's Dictionary

 

a fortiori

 adverb
adverb
BrE BrE//ˌeɪ ˌfɔːtiˈɔːraɪ//
 
; NAmE NAmE//ˌeɪ ˌfɔːrtiˈɔːraɪ//
 
(formal or law, from Latin)
 
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for or with an even stronger reason
See the Oxford Advanced American Dictionary entry: a fortiori