Definition of dosage
1a
: the addition of an ingredient or the application of an agent in a measured dose
b
: the presence and relative representation or strength of a factor or agent
2a
: dose sense 2
b(1)
: the giving of a dose
(2)
: regulation or determination of doses
3
: an exposure to some experience in or as if in measured portions
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Merriam-Webster unabridged
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Time Traveler for dosage
The first known use of dosage was circa 1867
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