*dosage*

n. [ Cf. F. dosage. See Dose, v. ] 1. (Med.) The administration of medicine in doses; specif., a scheme or system of grading doses of medicine according to age, etc. [ Webster 1913 Suppl. ]

2. The process of adding some ingredient, as to wine, to give flavor, character, or strength. [ Webster 1913 Suppl. ]

3. same as dose{ 1 }; as, 200 mg q.i.d. [ wns=1 ] [ PJC ]

4. the quantity of a medicine or other substance given to an animal, expressed as a quantity per body weight; as, use a dosage of 10 milligrams per kilogram [ PJC ]

5. the quantity of radiation given to or absorbed by an object; as, a maximum dosage of 1 mrad per day is allowed. [ wns=1 ]
Syn. -- dose. [ WordNet 1.5 +PJC ]