ratify
‘to give formal sanction to’
Lexical development traced from the Tamil root:
E. radefy, radifie, radyffy, ratyfye, ratefie, ratifien < O.F. ratifier < Med.Lat. ratificare ‘confirm, approve’ < Lat. ratus ‘fixed by calculation; determined; approved; certain, sure; valid’ < reri ‘to reckon, think’ + facere ‘to make’ < ra < re- < Tamil ār