endogamy 

‘marriage within the tribe or group’

Lexical development traced from the Tamil root:

    Gk. endon ‘in, within’ < en-do- + gamos ‘marriage’ < en < en < Tamil il-iṉ

Technical words derived from 'endogamy'

endogamous marriage - அகமணம்; band endogamy - சிறுகுழு - அகமணம்; territorial endogamy - நிலத்திணை அகமணம்; village endogamy - சிற்றூர் அகமணம்.

English words derived from Tamil il-iṉ connoting 'attaining'