Ma'anar ƙamus na "Legion Roman" ƙungiya ce ta soja ta tsohuwar sojojin Romawa, yawanci tana ƙunshi sojoji 3000 zuwa 6000. An tsara rundunonin zuwa ƙananan ƙungiyoyin da ake kira ƙungiyoyi, kuma kowace ƙungiya ta ƙunshi ƙarni, waɗanda aka ƙara zuwa ƙwanƙwasa, ko ƙungiyoyin sojoji takwas waɗanda ke raba tanti. Sojojin Roma sun shahara da horo, horo, da sassauƙan dabara, kuma sun kasance ɗaya daga cikin sojojin da suka fi samun nasara a tarihi, suna taka muhimmiyar rawa wajen faɗaɗa da kuma kiyaye daular Roma.