Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The process of nourishing or being nourished, especially the process by which a living organism assimilates food and uses it for growth and for replacement of tissues.
  • n. The science or study that deals with food and nourishment, especially in humans.
  • n. A source of nourishment; food.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The organic process by which an organism assimilates food and uses it for growth and maintenance.

from the GNU version of the Collaborative International Dictionary of English

  • n. In the broadest sense, a process or series of processes by which a living organism as a whole (or its component parts or organs) is maintained in its normal condition of life and growth.
  • n. In a more limited sense, the process by which the living tissues take up, from the blood, matters necessary either for their repair or for the performance of their healthy functions.
  • n. That which nourishes; nutriment.

from The Century Dictionary and Cyclopedia

  • n. The act or process by which organisms, whether vegetable or animal, absorb into their system their proper food and build it into their living tissues.
  • n. That which nourishes; nutriment.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a source of materials to nourish the body
  • n. the scientific study of food and drink (especially in humans)
  • 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

Etymologies

Middle English nutricion, from Old French nutrition, from Late Latin nūtrītiō, nūtrītiōn-, from Latin nūtrītus, past participle of nūtrīre, to suckle; see (s)nāu- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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