Respiration definitions

rĕs'pə-rā'shən
Act or process of respiring; breathing; inhaling and exhaling air.
noun
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The processes by which a living organism or cell takes in oxygen from the air or water, distributes and utilizes it in oxidation, and gives off products of oxidation, esp. carbon dioxide.
noun
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An analogous process in anaerobic organisms involving some substance other than free oxygen.
noun
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The action or process by which an organism without lungs, such as a fish or plant, exchanges gases with its environment.
noun
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Respiration is taking a breath or the act of breathing.

An example of respiration is inhaling and exhaling air.

noun
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The action or process by which an organism without lungs, such as a fish or plant, exchanges gases with its environment.
noun
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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.
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The process of inhaling and exhaling; breathing, breath.
noun
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An act of breathing; a breath.
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Any similar process, in organisms that lack lungs, that exchanges gases with its environment.
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The process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide.
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Origin of respiration

Middle English respiracioun, from Latin respiratio, from respirare.