dif·fer·en·tia /ˌdɪfəˈrɛn(t)ʃ(i)ə/
不同點,差異,種差
dif·fer·en·ti·a n.; pl. Differentiæ
1. Logic 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.
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differentia
n : distinguishing characteristics (especially in different
species of a genus)
[also: differentiae (pl)]