ذَاتِيَّةٌ

[a post-classical word, used in philosophy, The essential property or quality, or the aggregate of the essential properties or qualities, of a thing]. The ذَاتِيَّة of a human being is [the essential property or quality of] rational animality; and is also termed مَاهِيَّةٌ. (Kull p. 148.)