D defs.my
Entry 1 sense Webster, 1913

Decurion

· De·cu·ri·on · IPA /dɪˈkjʊəɹɪən/
01 n. A head or chief over ten; especially, an officer who commanded a division of ten soldiers.
  1. 1.
    A head or chief over ten; especially, an officer who commanded a division of ten soldiers.(Rom. Antiq.)