Definition of fortis adjective from the Oxford Advanced Learner's Dictionary

 

fortis

 adjective
adjective
BrE BrE//ˈfɔːtɪs//
 
; NAmE NAmE//ˈfɔːrtɪs//
 
(phonetics)
 
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(of a consonant) pronounced with force compare lenis Word Origin mid 20th cent.: from Latin, literally ‘strong’.
See the Oxford Advanced American Dictionary entry: fortis