emission

(noun) the act of emitting; causing to flow forth. Synonyms: emanation.

(noun) a substance that is emitted or released. Synonyms: discharge.

(noun) the release of electrons from parent atoms.

(noun) any of several bodily processes by which substances go out of the body. Synonyms: discharge, expelling. Example: "The discharge of pus."

(noun) the occurrence of a flow of water (as from a pipe).