Differentiae are classified as proximate and remote. A proximate differentia distinguishes a species from others within its proximate genus.
'Rational' is proximate for the human species because 'animal' is its proximate genus, and rationality marks its species-level distinction within animals.
Here 'proximate' refers to a position in the essential hierarchy, not to practical importance or everyday familiarity.
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The Five Predicables: Differentia, Property, Common Accident, Essential and Accidental Attributes
Differentiae are classified as proximate and remote. A proximate differentia distinguishes a species from others within its proximate genus.
'Rational' is proximate for the human species because 'animal' is its proximate genus, and rationality marks its species-level distinction within animals.
Here 'proximate' refers to a position in the essential hierarchy, not to practical importance or everyday familiarity.