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English Lexicon

Respiration

/ˌrɛs.pəˈreɪ.ʃən/
nounCEFR B2 (Upper)Top #4500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    The action of breathing; the movement of air into and out of the lungs.

    "The patient's respiration rate was monitored closely throughout the night."
  2. 2

    The biochemical process in which living cells break down organic molecules to release energy.

    "Cellular respiration produces ATP to fuel various biological functions in the body."
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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the Late Middle English word 'respiracioun', stemming from the Latin 'respiratio', meaning 'a breathing'. It is built from the prefix 're-' (denoting repetition or reversal) and 'spirare' (to breathe), evolving historically to describe both the physical act of breathing and the cellular metabolic process.

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