respiration

Reading level: hard

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. 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
  2. noun a single complete act of breathing in and out
  3. noun the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation

Etymology

From Middle English respiracioun, borrowed from Latin respīrātiō, respīrātiōnem.

In classic literature

Synonyms

internal respiration, cellular respiration

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