Webster’s Revised Unabridged Dictionary · 1913
Decurion
De·cu′ri·on (dē·kū′rĭ·ŏn), n. [L. decurio, decurionis, fr. decuria a squad of ten, fr. decem ten.] (Rom. Antiq.) A head or chief over ten; especially, an officer who commanded a division of ten soldiers.