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dosage (n.)

1867 in chemistry; 1874 in medicine, "act or practice of administering medication in doses," especially in reference to the size; see dose + -age, perhaps on model of French dosage (1812).

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Definitions of dosage from WordNet

dosage (n.)
the quantity of an active agent (substance or radiation) taken in or absorbed at any one time;
Synonyms: dose
dosage (n.)
a measured portion of medicine taken at any one time;
Synonyms: dose
From wordnet.princeton.edu