the size or frequency of a dose of a medicine or drug (药的)剂量;服法 a dosage of 450 milligrams a day. 每日450毫克的剂量。 [mass noun]there are recommendations about dosage in elderly patients. 有老年患者服用剂量的介绍。 ■a level of exposure to or absorption of ionizing radiation (受到的或吸收的)电离辐射剂量