The book defines species (nawʿ) as an essential universal predicated of individuals sharing one specific essence.
Zayd, Amr and Bakr are different people, but all are human. In this example they share the same specific nature, so 'human' is their species.
The crucial point is not merely that a word applies to several individuals; those individuals must share one specific essence.
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Definition of species
The Five Universals: Genus, Species, Differentia, Property, Common Accident
The book defines species (nawʿ) as an essential universal predicated of individuals sharing one specific essence.
Zayd, Amr and Bakr are different people, but all are human. In this example they share the same specific nature, so 'human' is their species.
The crucial point is not merely that a word applies to several individuals; those individuals must share one specific essence.