Definition of honoris causa adverb from the Oxford Advanced American Dictionary

 

honoris causa

 adverb
adverb
NAmE//ɑˌnɔrəs ˈkaʊsə//
 
, NAmE//ɑˌnɔrəsˈkaʊzə//
 
(from Latin)
 
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(especially of a degree) given to a person as a sign of honor and respect, without their having to take an exam She was awarded a degree honoris causa.
See the Oxford Advanced Learner's Dictionary entry: honoris causa