noun (n)

• the quantity of an active agent (substance or radiation) taken in or absorbed at any one time(noun.quantity)

  Synonym:
  dose
  

  source: wordnet30
• a measured portion of medicine taken at any one time(noun.artifact)

  source: wordnet30
• The administration of medicine in doses; specif., a scheme or system of grading doses of medicine according to age, etc.(noun)

  source: webster1913