1. 
[syn: discriminatory, preferential]
The Collaborative International Dictionary of English v.0.48:
Preferential \Pref`er*en"tial\, a.
   Giving, indicating, or having a preference or precedence; as,
   a preferential claim; preferential shares.
   [1913 Webster]
WordNet (r) 3.0 (2006):
preferential
    adj 1: manifesting partiality; "a discriminatory tax";
           "preferential tariff rates"; "preferential treatment"; "a
           preferential shop gives priority or advantage to union
           members in hiring or promoting" [syn: discriminatory,
           preferential]