Harold Austerman
Cassell's Latin Dictionary and the Oxford Latin Dictionary provide the additional definitions:
Cassell's Latin Dictionary:
coacto - To compel.
coactor - 1. a collector of rents, money at auctions, etc. 2. One who compels.
Oxford Latin Dictionary:
coacto - To compel.
coactor - 1. A collector (of money, taxes, etc.). 2. the troops bringing up the rear.