Webster's English Dictionary

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differentia

dif.fer.en.tia \.dif-*-'ren-ch(e--)*\ \-che--.e-,-che--.i-\ n or 
   dif.fer.en.ti.ae [L, difference, fr. different-, differens] pl  1: the 
   property or mark distinguishing a species from other species of the  same 
   genus 2: the element, feature, or factor that distinguishes one entity, 
   state, or  class from another