1502, 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."