Definition of respiration in US English:

respiration

noun

  • 1The action of breathing.

    ‘opiates affect respiration’
    • ‘Blood pressure and respiration are checked every five minutes, and the patient's temperature also is recorded.’
    • ‘The effects of sleep on respiration include changes in central respiratory control, airways resistance, and muscular contractility.’
    • ‘Every aspect of life depends on muscular activity, whether it be speech, eating and digestion, respiration, all expressions of brain function.’
    • ‘Participants were children aged 2-59 months with complaints of cough, rapid respiration, or difficulty in breathing.’
    • ‘In mammals, external respiration - the ventilation of the lungs - is achieved by breathing, the mechanical basis of respiration: the terms are sometimes used synonymously.’
    1. 1.1Medicine A single breath.
      • ‘Before and after each administration of salmeterol or placebo, patients were assessed for heart rate, respirations, and breath sounds.’
      • ‘By using opiate analgesics and sedatives to provide comfort to a dying patient, we risk depressing respirations and causing hypotension, which may hasten death.’
      • ‘They have noisy respirations, and expiratory stridor is usually present from birth.’
      • ‘Patients should be admitted to the hospital if respirations continue to be labored or their O 2 saturation is less than or equal to 90%.’
      • ‘In the respiratory form, sinus arrhythmia typically varies with respirations, and the heart rate (RR interval) increases with inspiration and decreases with expiration.’
      gulp of air, inhalation, inspiration
      View synonyms
    2. 1.2Biology A process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.
      • ‘Oxygen free radicals in root cells would be formed in the process of root respiration in the mitochondria and the oxidation of secondary metabolites such as soluble phenols.’
      • ‘First, and most obvious, there is the role of respiration in energy metabolism.’
      • ‘Lipids provide material for respiration and energy production, and serve as vitamins, hormones and structural components of biological membranes.’
      • ‘Temporal relationships between organic carbon production and respiration are not well understood in coral reef ecosystems.’
      • ‘Root respiration provides metabolic energy for growth and maintenance of root biomass and for ion transport.’

Origin

Late Middle English: from Latin respiratio(n-), from respirare ‘breathe out’ (see respire).

Pronunciation

respiration

/ˌrɛspəˈreɪʃ(ə)n//ˌrespəˈrāSH(ə)n/