Where does “مرتبة” come from?

مرتبة (Hijazi Arabic) comes from Arabic مَرْتَبَة — rank, degree.

مرتبة (Hijazi Arabic): rank; mattress; degree

Definitions

Step	Language	Word	Meaning
1	Arabic	مَرْتَبَة	rank, degree

مرتبة — Etymology, Origin & Word History | Etymology Explorer