Webster's English Dictionary

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dose

1. dose \'do-s\ n [F, fr. LL dosis, fr. Gk, lit., act of giving, fr. 
   didonai to give]- more at DATE 1a: the measured quantity of a therapeutic 
   agent to be taken at one time  1b: the quantity of radiation administered 
   or absorbed  2: a portion of a substance added during a process  3: a 
   portion of an experience to which one is exposed 
2. dose vt 1: to give a dose to; esp : to give medicine to  2: to divide 
   (as a medicine) into doses  3: to treat with an application or agent