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Definition diet

Etymology 1

From Middle English diet, dyet, diete, from Old French diete, from Medieval Latin dieta (“regimen, regulation; assembly”), from Latin diaeta, from Ancient Greek δίαιτα (díaita).


diet (plural diets)

  1. The food and beverage a person or animal consumes.
  2. (countable) A controlled regimen of food and drink, as to gain or lose weight or otherwise influence health.
  3. (by extension) Any habitual intake or consumption.

diet (not comparable)

  1. (of a food or beverage) Containing less fat, salt, sugar, or calories than normal, or claimed to have such.
  2. (informal, figuratively) Having certain traits subtracted.

Etymology 2

From Middle English dieten, dyeten, diȝeten, from Old French dïeter and Medieval Latin diētāre.


diet (third-person singular simple present diets, present participle dieting, simple past and past participle dieted)

  1. (transitive) To regulate the food of (someone); to put on a diet.
  2. (intransitive) To modify one's food and beverage intake so as to decrease or increase body weight or influence health.
  3. (obsolete) To eat; to take one's meals.
  4. (obsolete, transitive) To cause to take food; to feed.

Etymology 3

From Middle English diet, dyet, from Old French diete, from Medieval Latin diēta, diaeta (“a public assembly; set day of trial; a day's journey”), from Latin diēs (“day”).


diet (plural diets)

  1. (usually capitalized as a proper noun) A council or assembly of leaders; a formal deliberative assembly.
  2. (Scotland, law) The proceedings under a criminal libel.
  3. (Scotland) A clerical or ecclesiastical function in Scotland.

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