«وهو على أربعة أقسام»
And it has four kinds.
1. Complete essential definition (hadd tamm): proximate genus and proximate differentia.
2. Incomplete essential definition (hadd naqis): remote genus with proximate differentia, or the proximate differentia alone.
3. Complete descriptive definition (rasm tamm): proximate genus and a property.
4. Incomplete descriptive definition (rasm naqis): remote genus with a property, or the property alone.
Essential definitions rely on essential constituents; descriptions identify by a distinguishing property.