Definition of honoris causa adverb from the Oxford Advanced Learner's Dictionary

 

honoris causa

 adverb
adverb
BrE BrE//ɒˌnɔːrɪs ˈkaʊzə//
 
; NAmE NAmE//əˌnɔːrəs ˈkɔːzə//
 
(from Latin)
 
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(especially of a degree) given to a person as a sign of honour and respect, without their having to take an exam She was awarded a degree honoris causa. Word OriginLatin, literally ‘for the sake of honour’.
See the Oxford Advanced American Dictionary entry: honoris causa