in plants. process by which carbohydrates are converted into energy by using oxygen.

Merriam-Webster Online Dictionary
respiration (noun)
a) the placing of air or dissolved gases in intimate contact with the circulating medium of a multicellular organism (as by breathing)
b) a single complete act of breathing
the physical and chemical processes by which an organism supplies its cells and tissues with the oxygen needed for metabolism and relieves them of the carbon dioxide formed in energy-producing reactions
any of various energy-yielding oxidative reactions in living matter
respiration (Wikipedia)

Respiration may refer to:

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