The process of inhaling and exhaling; breathing, breath.
User Defined Definitions
"the metabolic processes whereby certain organisms obtain energy from organic molecules; processes that take place in the cells and tissues during which energy is released and carbon dioxide is produce"
"a single complete act of breathing in and out"
"the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation"