1) Ancient Roman title 2) The head of a decury 
[administrative] A decurion was a member of a city senate in the Roman Empire. Decurions were drawn from the curiales class, which was made up of the wealthy middle class citizens of a town society. The emergence of the post of decurion may be found in Rome`s decision to allow office-holders in Latin colonies in Italy to become Roman citize...
• (n.) A head or chief over ten; especially, an officer who commanded a division of ten soldiers.
De·cu'ri·on noun [ Latin decurio , decurionis , from decuria a squad of ten, from decem ten.] (Rom. Antiq.) A head or chief over ten; especially, an officer who commanded a division of ten soldiers. 
decurion 1. A head or chief over ten; especially, an officer who commanded a division of ten soldiers. 2. In ancient Rome, an officer in command of ten soldiers. 3. A council member in the Roman Empire
the head of a decury. · a member of the senate of an ancient Roman colony or municipality.