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The Collaborative International Dictionary of English v.0.48 (gcide)

Dosage \Dos"age\ (d[=o]s"[asl]j), 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. [WordNet sense 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.
[WordNet sense 1]

Syn: dose.
[WordNet 1.5 PJC]