Definition of preferential adjective from the Oxford Advanced American Dictionary

 

preferential

 adjective
adjective
NAmE//ˌprɛfəˈrɛnʃl//
 
[only before noun]
 
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giving an advantage to a particular person or group Don't expect to get preferential treatment. Our preferred customers get preferential rates.
preferentially
 
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NAmE//ˌprɛfəˈrɛnʃəli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: preferential