Etymology
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nutrition (n.)

1550s, "act or process by which organisms absorb their proper food into their systems and build it into living tissue," from Old French nutrition (14c.) and directly from Latin nutritionem (nominative nutritio) "a nourishing," noun of action from past-participle stem of nutrire "to nourish, suckle, feed," from PIE *nu-tri-, suffixed form (with feminine agent suffix) of *(s)nau- "to swim, flow, let flow," hence "to suckle," extended form of root *sna- "to swim." Meaning "that which nourishes, nutriment" is from c. 1600. Related: Nutritional.

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Definitions of nutrition

nutrition (n.)
(physiology) the organic process of nourishing or being nourished; the processes by which an organism assimilates food and uses it for growth and maintenance;
nutrition (n.)
a source of materials to nourish the body;
Synonyms: nutriment / nourishment / sustenance / aliment / alimentation / victuals
nutrition (n.)
the scientific study of food and drink (especially in humans);
From wordnet.princeton.edu