DECURION Meaning of DECURION in English [de.cu.ri.on] n [ME decurioun, fr. L decurion-, decurio, fr. decuria division of ten, fr. decem] (14c) 1: a Roman cavalry officer in command of 10. men 2: a member of a Roman senate Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012