Decurion definitions Webster's 1828 Dictionary DECURION, n. [L. Ten] An officer in the Roman army, who ... Merriam Webster's noun Etymology: Middle English decurioun, from Latin decurion-, decurio, from decuria division of ten, from decem Date: 14th ... a member of a Roman senate Webster's 1913 Dictionary Decurion De*cu"ri*on, n. [L. decurio, decurionis, fr. decuria ...