[noo-trish-uhn, nyoo-]
the act or process of nourishing or of being nourished.
the science or study of, or a course of study in, nutrition, especially of humans.
the process by which organisms take in and utilize food material.
food; nutriment.
the pursuit of this science as an occupation or profession.

1375–1425; late Middle English < Late Latin nūtrītiōn- (stem of nūtrītiō) a feeding, equivalent to Latin nūtrīt(us) (past participle of nūtrīre to feed, nourish) + -iōn- -ion

nutritional, nutritionary, adjective
nutritionally, adverb
hypernutrition, noun
supernutrition, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nutrition (njuːˈtrɪʃən)
1.  a process in animals and plants involving the intake of nutrient materials and their subsequent assimilation into the tissuesRelated: alimentary, trophic
2.  the act or process of nourishing
3.  the study of nutrition, esp in humans
Related: alimentary, trophic
[C16: from Late Latin nūtrītiō, from nūtrīre to nourish]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1551 (nutritive is recorded from c.1400), from L. nutritionem (nom. nutritio) "a nourishing," from nutrire "nourish, suckle" (see nourish). Nutritious is first attested 1665, from L. nutricius "that which nourishes, nurses," from nutrix (gen. nutricis) "a nurse," from nutrire.
First record of nutritionist is from 1926.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

nutrition nu·tri·tion (nōō-trĭsh'ən, nyōō-)

  1. The process by which a living organism assimilates food and uses it for growth, liberation of energy, and replacement of tissues; its successive stages include digestion, absorption, assimilation, and excretion.

  2. The science or study that deals with food and nourishment, especially in humans.

nu·tri'tion·al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
nutrition   (n-trĭsh'ən)  Pronunciation Key 
  1. The process by which living organisms obtain food and use it for growth, metabolism, and repair. The stages of nutrition include ingestion, digestion, absorption, transport, assimilation, and excretion.

  2. The scientific study of food and nourishment, including food composition, dietary guidelines, and the roles that various nutrients have in maintaining health.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Ardent label readers scan nutritional labels for ingredients that they don't
  want in their diet.
Frying the little suckers might take away some of the nutritional value, but
  this might still be better than a candy bar.
As with fast food, the taste has instant appeal and is addictive, but the
  nutritional value is low.
The nutritional requirements for humans and monkeys has been well established
  by reliable peer reviewed studies for decades.
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