A complete essential definition does more than place the definiendum in a class: it states the feature that essentially separates the species from other members of that class.
“Human is an animal” names a genus but does not distinguish humans from horses, goats, and other animals.
“Human is a rational animal” adds the appropriate differentia, thereby distinguishing the species.
The proximate genus alone is not enough for hadd tamm; the proximate differentia must accompany it.
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Definition and Its Four Forms: Complete/Incomplete Essential and Descriptive Definitions
A complete essential definition does more than place the definiendum in a class: it states the feature that essentially separates the species from other members of that class.
“Human is an animal” names a genus but does not distinguish humans from horses, goats, and other animals.
“Human is a rational animal” adds the appropriate differentia, thereby distinguishing the species.
The proximate genus alone is not enough for hadd tamm; the proximate differentia must accompany it.