Where does “تجمع” come from?

تجمع (Persian) comes from Arabic تَجَمُّع, from Arabic جَمْع — gathering.

تجمع (Persian): coming together, assembling, gathering

Definitions

Step	Language	Word	Meaning
1	Arabic	تَجَمُّع	—
2	Arabic	جَمْع	gathering

تجمع — Etymology, Origin & Word History | Etymology Explorer