The quantity of medicine given, or prescribed to be taken, at one time.

A sufficient quantity; a portion; as much as one can take, or as falls to one to receive.

Anything unpleasant that one is obliged to take; a disagreeable portion thrust upon one; also used figuratively, as to give someone a dose of his own medicine, i. e. to retaliate in kind.

a quantity of radiation which an object absorbs, or to which it is exposed.