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

 

preferential

 adjective
adjective
BrE BrE//ˌprefəˈrenʃl//
 
; NAmE NAmE//ˌprefəˈrenʃl//
 
[only before noun]
 
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giving an advantage to a particular person or group Don't expect to get preferential treatment. Bank employees usually get preferential rates of interest. Word Origin mid 19th cent.: from preference, on the pattern of differential.
See the Oxford Advanced American Dictionary entry: preferential