respiration

noun4

1. •
   The process of inhaling and exhaling.

   • In the dead state all is apparently without motion. No agent within indicates design, intelligence, or foresight: there is no respiration; […] — 1822
2. •
   An act of breathing: a single breath.

   • Gowan snored, each respiration choking to a huddle fall, as though he would never breathe again. — 1931
3. •
   Any similar process in an organism that lacks lungs that exchanges gases with its environment.
4. •
   The process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide.