What is the meaning of respiration?

noun

• 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 produced and absorbed by the blood to be transported to the lungs.
  • synonyms: internal respiration, cellular respiration
• A single complete act of breathing in and out.
  • usage: "thirty respirations per minute"
• The bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation.
  • synonyms: breathing, external respiration, ventilation