negotiator

negōtiātor ōris, m

negotior, a wholesale dealer, merchant, banker, factor , S., C.

negotiator
nĕgōtĭātor (nĕgōc-), ōris, m. [negotior], I one who does business by wholesale, a wholesale dealer...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
Negotiator
·noun One who negotiates; a person who treats with others, either as principal or agent, in respect ...

Webster's Dictionary of the English Language