[ dahy-it ]
See synonyms for: dietdieting on

  1. food and drink considered in terms of its qualities, composition, and its effects on health: The ad shows milk and dairy as a wholesome part of our daily diet.

  2. a particular selection of food, especially as designed or prescribed to improve a person's physical condition or to prevent or treat a disease: A diet low in sugar is often recommended for diabetes prevention.

  1. a selection of food that emphasizes caloric restriction or otherwise limits the amount a person eats, usually intended to induce weight loss: No pie for me, I'm on a diet.

  2. the foods eaten, as by a particular person or group: The Mediterranean diet consists historically of fish, fruit, vegetables, whole grains, and nuts.

  3. food or feed habitually eaten or provided: The rabbits were fed a diet of carrots and lettuce.

  4. anything that is habitually provided or partaken of: Television has given us a steady diet of reality shows and police procedurals.

  1. suitable for consumption as part of a selection of food intended to induce weight loss: I usually drink diet soft drinks.

  2. formulated to be lower in calories, fat, sugar, etc. than a similar food: The diet version of the cookie does taste different.

verb (used without object),di·et·ed, di·et·ing.
  1. to select or limit the food one eats to improve one's physical condition or to lose weight: I've dieted all month and lost only one pound.

  2. to eat or feed according to the requirements of a particular or prescribed selection of food.

verb (used with object),di·et·ed, di·et·ing.
  1. to regulate the food of, especially in order to improve the physical condition: They dieted the dog to a healthy weight of 20 pounds.

  2. to feed.

Origin of diet

First recorded in 1175–1225; Middle English noun diete “day’s journey, appointed day, way of living,” from Anglo-French, Old French diete, from Latin diaeta, from Greek díaita “way of living, diet,” equivalent to dia- dia- + -aita (akin to aîsa “share, lot”; the verb is derivative of the noun

Other words from diet

  • di·et·er, noun
  • non·di·et·er, noun
  • non·di·et·ing, adjective, noun

Words Nearby diet

Other definitions for diet (2 of 2)

[ dahy-it ]

  1. the legislative body of certain countries, as Japan.

  2. the general assembly of the estates of the former Holy Roman Empire.

Origin of diet

First recorded in 1400–50; late Middle English, from Medieval Latin diēta “public assembly,” the same word as Latin diaeta with sense affected by Latin diēs “day”; see diet1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use diet in a sentence

British Dictionary definitions for diet (1 of 2)


/ (ˈdaɪət) /

    • a specific allowance or selection of food, esp prescribed to control weight or in disorders in which certain foods are contraindicated: a salt-free diet; a 900-calorie diet

    • (as modifier): a diet bread

  1. the food and drink that a person or animal regularly consumes: a diet of nuts and water

  1. regular activities or occupations

  1. (usually intr) to follow or cause to follow a dietary regimen

Origin of diet

C13: from Old French diete, from Latin diaeta, from Greek diaita mode of living, from diaitan to direct one's own life

Derived forms of diet

  • dieter, noun

British Dictionary definitions for diet (2 of 2)


/ (ˈdaɪət) /

  1. (sometimes capital) a legislative assembly in various countries, such as Japan

  2. Also called: Reichstag (sometimes capital) the assembly of the estates of the Holy Roman Empire

  1. Scots law

    • the date fixed by a court for hearing a case

    • a single session of a court

Origin of diet

C15: from Medieval Latin diēta public meeting, probably from Latin diaeta diet 1 but associated with Latin diēs day

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012