Definition of a fortiori adverb from the Oxford Advanced American Dictionary

 

a fortiori

 adverb
adverb
NAmE//ˌeɪ ˌfɔrt̮iˈɔraɪ//
 
, NAmE//ˌɑ ˌfɔrt̮iˈɔri//
 
, NAmE//‑ˌfɔrʃi‑//
 
(from Latin)(formal or law)
 
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for or with an even stronger reason
See the Oxford Advanced Learner's Dictionary entry: a fortiori