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

 

lenis

 adjective
adjective
BrE BrE//ˈlenɪs//
 
; NAmE NAmE//ˈlɪːnɪs//
 
(phonetics)
 
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(of a consonant) pronounced with not much force compare fortis Word Origin early 20th cent.: from Latin, literally ‘mild, gentle’.
See the Oxford Advanced American Dictionary entry: lenis