Dictionary.com

respiration

[ res-puh-rey-shuhn ]
/ ˌrɛs pəˈreɪ ʃən /
Save This Word!

noun
the act of respiring; inhalation and exhalation of air; breathing.
Biology.
  1. the sum total of the physical and chemical processes in an organism by which oxygen is conveyed to tissues and cells, and the oxidation products, carbon dioxide and water, are given off.
  2. an analogous chemical process, as in muscle cells or in anaerobic bacteria, occurring in the absence of oxygen.
QUIZ
CUDDLE UP! A COZY QUIZ ON FALL WORDS HAS ARRIVED
If autumn is your ideal season, spice up your repertoire of "fall" vocabulary with this quiz on some warm and vivid descriptive words for the season.
Question 1 of 10
Which of the following words means “to make a crackling sound; crackle”?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of respiration

1400–50; late Middle English respiracioun<Latin respīrātiōn- (stem of respīrātiō) a breathing out, equivalent to respīrāt(us) (past participle of respīrāre to respire) + -iōn--ion

OTHER WORDS FROM respiration

res·pi·ra·tion·al, adjectivepre·res·pi·ra·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use respiration in a sentence

British Dictionary definitions for respiration

respiration
/ (ˌrɛspəˈreɪʃən) /

noun
the process in living organisms of taking in oxygen from the surroundings and giving out carbon dioxide (external respiration). In terrestrial animals this is effected by breathing air
the chemical breakdown of complex organic substances, such as carbohydrates and fats, that takes place in the cells and tissues of animals and plants, during which energy is released and carbon dioxide produced (internal respiration)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for respiration

respiration
[ rĕs′pə-rāshən ]

n.
The act or process of inhaling and exhaling; breathing.ventilation
The act or process by which an organism without lungs, such as a fish or plant, exchanges gases with its environment.
The oxidative process occurring within living cells by which the chemical energy of organic molecules is released in a series of metabolic steps involving the consumption of oxygen and the liberation of carbon dioxide and water.
Any of various analogous metabolic processes by which organisms, such as fungi, obtain energy from organic molecules.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for respiration

respiration
[ rĕs′pə-rāshən ]

The process by which organisms exchange gases, especially oxygen and carbon dioxide, with the environment. In air-breathing vertebrates, respiration takes place in the lungs. In fish and many invertebrates, respiration takes place through the gills. Respiration in green plants occurs during photosynthesis.
See cellular respiration.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for respiration

respiration

The conversion of oxygen by living things into the energy by which they continue life. Respiration is part of metabolism.

notes for respiration

Carbon dioxide is a waste product of respiration.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
FEEDBACK