dosage

[doh-sij]
noun
1.
the administration of medicine in doses.
2.
the amount of medicine to be given.
3.
Physics. dose.
4.
the process of adding a sugar solution to champagne and other sparkling wines before final corking.

Origin:
1840–50; dose + -age

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World English Dictionary
dosage (ˈdəʊsɪdʒ)
 
n
1.  the administration of a drug or agent in prescribed amounts and at prescribed intervals
2.  the optimum therapeutic dose and optimum interval between doses
3.  dose another name for dose

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

dosage
1867, from dose + -age.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dosage dos·age (dō'sĭj)
n.

  1. Administration of a therapeutic agent in prescribed amounts.

  2. Determination of the amount to be so administered.

  3. The amount so administered.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Doctors admit they have reached the limits of effective dosage with
  chemotherapy.
Perhaps my dosage was too low, or my nutmeg too desiccated.
The only problem with magic mushrooms and other hallucinogens is the matter of
  dosage.
They perform complex developmental tasks, tasks that require precise dosage and
  exquisite timing.
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