from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The act or process of inhaling and exhaling; breathing. Also called ventilation.
- n. The act or process by which an organism without lungs, such as a fish or plant, exchanges gases with its environment.
- n. 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.
- n. Any of various analogous metabolic processes by which certain organisms, such as fungi and anaerobic bacteria, obtain energy from organic molecules.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The process of inhaling and exhaling; breathing, breath.
- n. An act of breathing; a breath.
- n. Any similar process, in organisms that lack lungs, that exchanges gases with its environment.
- n. The process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide.
from the GNU version of the Collaborative International Dictionary of English
- n. The act of respiring or breathing again, or catching one's breath.
- n. Relief from toil or suffering: rest.
- n. Interval; intermission.
- n. The act of resping or breathing; the act of taking in and giving out air; the aggregate of those processes bu which oxygen is introduced into the system, and carbon dioxide, or carbonic acid, removed.
from The Century Dictionary and Cyclopedia
- n. The act of breathing again or resuming life.
- n. The inspiration and expiration of air.
- n. That function by which there takes place an absorption of oxygen from the surrounding medium into the blood with a corresponding excretion of carbon dioxid.
- n. In physiological bot., a process consisting in the absorption by plants of oxygen from the air, the oxidation of assimilated products, and the release of carbon dioxid and watery vapor.
- n. The respiratory murmur.
- n. A breathing-spell; an interval.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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
- n. the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation
- n. a single complete act of breathing in and out
Middle English respiracioun, from Latin respiratio, from respirare. (Wiktionary)