emission emission /ɪˈmɪʃən/

noun

1. () The act of emitting; causing to flow forth  ( emanation , emission )
   the act of emitting; causing to flow forth
     The car's high emissions contributed to air pollution.
   The car's high emissions contributed to air pollution.
   
2. The occurrence of a flow of water (as from a pipe)  ( emission )
   the occurrence of a flow of water (as from a pipe)
   
3. Any of several bodily processes by which substances go out of the body  ( emission , expelling , discharge )
   any of several bodily processes by which substances go out of the body
    The discharge of pus
   the discharge of pus
   
4. The release of electrons from parent atoms  ( emission )
   the release of electrons from parent atoms
   
5. A substance that is emitted or released  ( emission , discharge )
   a substance that is emitted or released