respiration

/ˌrɛspəˈreɪʃən/
noun
  1. The act or process of breathing.
    • Smoking damages the organs involved in respiration.
    • Deep respiration can help you relax and reduce stress.
    • The doctor checked the patient's respiration rate.
  2. The chemical process in living cells that releases energy from food.
    • Plants carry out respiration both day and night.
    • During exercise, your respiration speeds up to produce more energy.
    • Cellular respiration converts glucose into energy for the body.