Definition of "diet"

It is common policy to order no more diet than will be used within one month.

2013, Martin D Buckland, Lynda Hall, Alan Mowlem, A Guide to Laboratory Animal Technology, page 56

Last week the aging video game retailer emerged as the hottest stock on Wall Street, a story just unexpected and absurd enough to fill the new Trump-shaped void in our nation’s media diet.

2021 February 3, Farhad Manjoo, “Can We Please Stop Talking About Stocks, Please?”, in The New York Times‎

Many grocery chains offer premium-priced lean or diet hamburger; but the fat content is usually at least 10 percent, sometimes 15 percent or more.

1982, Consumer Guide, Dieter's Complete Guide to Calories, Carbohydrates, Sodiums, Fats & Cholesterol, page 18

The difference in weight (mass) of the regular and the diet drink of the same brand roughly equals to the amount of sugar in the regular drink.

1998, Andy Sae, Chemical Magic from the Grocery Store

Diet Light (Pizarro 724; snacks S2-7; 9:30am-10pm)This perennially busy place serves not-very-diet, but yummy nonetheless, ice cream (S2 to S5) and whopping servings of mixed fruit (S3) – with ice cream.

2010, Lonely Planet Peru, page 347

they will diet themselves, feed and live alone.

1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps

When all signs of effusion, dulness, pain, œgophony, and cough had disappeared he was dieted, stimulated, and tonicked.

1887, Medical Press and Circular, volume 94, page 461

As illustrating the belief that the Baptism by Blood was accompanied by a real regeneration of the devotee, Frazer quotes an ancient writer who says that for some time after the ceremony the fiction of a new birth was kept up by dieting the devotee on milk, like a new-born babe.

1920, Edward Carpenter, Pagan and Christian Creeds, New York: Harcourt, Brace and Co., published 1921, page 45

Let him […] diet in such places, where there is good company of the nation, where he travelleth.

1625, Francis [Bacon], “Of Travel”, in The Essayes […], 3rd edition, London: […] Iohn Haviland for Hanna Barret

But partly led to diet my revenge […] .

c. 1603–1604 (date written), William Shakespeare, “The Tragedie of Othello, the Moore of Venice”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals)

Normally the diet begins towards the end of April.

“Coronavirus: School exam timetable could be put back next year”, in BBC News website‎, BBC, 14 June 20, retrieved 23 June 20