- noun a substance discharged into the air by an internal combustion engine or other device
Cars & Driving
- noun the passing of gases and other toxic substances into the atmosphere
- The process of giving off, or sending out. For example, the emission of electrons by a cathode in an electron tube, the electromagnetic waves radiated by an antenna, or the emission of alpha, beta, or gamma rays by unstable atomic nuclei.
- verb an act of emitting something