2. 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
3. an analogous process in anaerobic organisms involving some substance other than free oxygen
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'respiration'ME respiracioun < L respiratio < respiratus, pp.