D defs.my
Entry 2 senses Webster, 1913

differentia

· dif·fer·en·ti·a · IPA /dɪfəˈɹɛnʃɪə/
01 n. The formal or distinguishing part of the essence of a species, by which it is distinguished from other members of its genus; the characteri…
pl. Differentiæ ((#))
  1. 1.
    The formal or distinguishing part of the essence of a species, by which it is distinguished from other members of its genus; the characteristic attribute of a species; specific difference; as, a proper definition must have both genus and differentia.(Logic)
  2. 2.
    the set of characteristics distinguishing an entity from related entities.