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

 

preferentially

 adverb
adverb
BrE BrE//ˌprefəˈrenʃəli//
 
; NAmE NAmE//ˌprefəˈrenʃəli//
 
 
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in a way that gives an advantage to a particular person or group Club members would be treated preferentially.