Where does “চন” come from?

চন (Assamese) comes from Sanskrit सन्, from Proto-Indo-Iranian *sanH-.

চন (Assamese): year

Definitions

Step	Language	Word	Meaning
1	Sanskrit	सन्	to gain, acquire, obtain as a gift, possess,...
2	Proto-Indo-Iranian	*sanH-	—

চন — Etymology, Origin & Word History | Etymology Explorer