Word Origin & History
pecuniaryc.1500, from L. pecuniarius "pertaining to money," from pecunia "money, property, wealth," from pecu "cattle, flock," from PIE base *peku- (cf. Skt. pasu- "cattle," Goth. faihu "money, fortune," O.E. feoh "cattle, money"). Livestock was the measure of wealth in the ancient world. For a related sense
development in O.E., see
fee. Cf. also Welsh tlws "jewel," cognate with Ir. tlus "cattle," connected via notion of "valuable thing."