Definition of Respiration

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.

Exact synonyms: Cellular Respiration, Internal Respiration
Generic synonyms: Metabolic Process, Metabolism
Derivative terms: Respire

2. Noun. A single complete act of breathing in and out. "Thirty respirations per minute"

3. Noun. The bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation.

Definition of Respiration

1. n. The act of respiring or breathing again, or catching one's breath.

Definition of Respiration

1. Noun. The process of inhaling and exhaling; breathing, breath. ¹

2. Noun. An act of breathing; a breath. ¹

3. Noun. Any similar process, in organisms that lack lungs, that exchanges gases with its environment. ¹

4. Noun. The process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide. ¹

¹ Source:

Definition of Respiration

1. [n -S]

Medical Definition of Respiration

1. Term used by physiologists to describe the process of breathing and by biochemists to describe the intracellular oxidation of substrates coupled with production of ATP and oxidized coenzymes (NAD and FAD). This form of respiration may be anaerobic as in glycolysis or aerobic in the case of oxidations operating via the tricarboxylic acid cycle and the electron transport chain. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Respiration Pictures

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Lexicographical Neighbors of Respiration

respice finem
respirable aerosols
respiration (current term)
respiration disorders
respiration rate
respirator brain
respiratory acidosis
respiratory airway
respiratory alkalosis
respiratory apparatus

Literary usage of Respiration

Below you will find example usage of this term as found in modern and/or classical literature:

1. Science by American Association for the Advancement of Science (1905)
"this disappearance üf oxygen and formation of carbon dioxide are only the external indication of respiration, as has been long recognized. ..."

2. The American Journal of the Medical Sciences by Southern Society for Clinical Investigation (U.S.) (1876)
"Artificial respiration in Fulminant Apoplexy.—Some nine years ago Prof. ... By artificial respiration the blood is saturated with the oxygen, ..."

3. The Journal of Experimental Medicine by Rockefeller University, Rockefeller Institute, Rockefeller Institute for Medical Research (1906)
"Such periodic respiration may consist of smaller or larger groups of equal respirations, of respirations of gradually decreasing or gradually increasing ..."

4. The Journal of Biological Chemistry by American Society of Biological Chemists (1917)
"SOME FACTORS INFLUENCING THE respiration OF GROUND NERVOUS TISSUE. By CG MacARTHUR and OC JONES. (From the Department of Biochemistry of the University of ..."

5. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"Depth of respiration.—The depth of respiration is measured by the quantity of air inspired or expired in the act ; but the deepest expiration possible ..."

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