Webster's English Dictionary

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preferential

pref.er.en.tial \.pref-*-'ren-ch*l\ \-'rench-(*-)le-\ aj 1: showing 
   preference  2: employing or creating a preference in trade relations  3: 
   designed to permit expression of preference among candidates  4: giving 
   preference esp. in hiring to union members {~ shop}  - pref.er.en.tial.ly 
   av