emission
     n 1: the act of emitting; causing to flow forth [syn: {emanation}]
     2: a substance that is emitted or released [syn: {discharge}]
     3: the release of electrons from parent atoms
     4: any of several bodily processes by which substances go out
        of the body; "the discharge of pus" [syn: {discharge}, {expelling}]
     5: the occurrence of a flow of water (as from a pipe)
Source: WordNet® 2.0