Where does “تِجَارَت” come from?

تِجَارَت (Classical Persian) comes from Arabic تِجَارَة, from Arabic تَجَرَ.

Ancestry of “تِجَارَت”, step by step

Step	Language	Word	Meaning
1	Arabic	تِجَارَة	commerce, trade
2	Arabic	تَجَرَ	—