An Etymological Dictionary of the German Language/Rede
Rede, f., ‘speech, discourse, oration,’ from MidHG. ręde, OHG. rędia, ręda, f., ‘account, speech and reply, speech, narrative, information’; corresponding to OSax. ręðia, f., ‘account,’ Goth. raþjô, f., ‘account, bill, number’; to this is allied Goth. garaþjan, ‘to count,’ and further the phonetic equivalent Lat. ratio, ‘computation, account, number,’ &c. From the same Teut. root raþ (pre-Teut. rat), signifying ‘number,’ hund-ert (which see) is derived. —