Definition of proprietorially adverb from the Oxford Advanced Learner's Dictionary

 

proprietorially

 adverb
adverb
BrE BrE//prəˌpraɪəˈtɔːriəli//
 
; NAmE NAmE//prəˌpraɪəˈtɔːriəli//
 
(formal)
 
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in the manner of an owner of something