I.a means of managing or governing, e. g. a rudder, helm (poet. and in post-class. prose).
II. Trop.: rerum, the helm, i. e. the management of affairs, the government of the state, Ov. M. 6, 677; also, a means of moderating, mitigating, controlling: verum serenitas nostra certum moderamen invenit, Cod. Th. 11, 30, 64.