monopolium

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

mŏnŏpōlĭum, ii, n., = μονοπώλιον,

the exclusive privilege of dealing in or selling a thing, a monopoly (post-Aug.), Suet. Tib. 71; 30; Plin. 8, 37, 56, § 135.