Plenipotentiary \Plen`i*po*ten"ti*a*ry\
(pl[e^]n"[i^]*p[-o]*t[e^]n"sh[i^]*[asl]*r[y^]), n.; pl.
{Plenipotentiaries}. [LL. plenipotentiarius: cf. F.
pl['e]nipotentiaire.]
A person invested with full power to transact any business;
especially, an ambassador or envoy to a foreign court, with
full power to negotiate a treaty, or to transact other
business.
[1913 Webster]