diet Definition in the Cambridge English Dictionary
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Definition of “diet” - English Dictionary

Definition of "diet" - American English Dictionary

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dietnoun [C/U]

 us   /ˈdɑɪ·ɪt/
the ​food and ​drink usually taken by a ​person or ​group: [C] A ​healthy diet ​includesfreshvegetables. [C] fig. Gifted ​students given a ​steady diet of grade-level ​curriculumlearn they don’t need to ​work hard. A diet is also the ​particularfood and ​drink you are ​limited to when you cannot ​eat or ​drink whatever you ​want to: [C] a low-salt diet [C] I’m going on a diet because I’ve got to ​lose some ​weight.
dietary
adjective  us   /ˈdɑɪ·ɪˌter·i/
Health ​experts say dietary ​changes have to ​start with ​children, who can be ​taught to ​appreciate a ​healthy diet.

dietverb [I]

 us   /ˈdɑɪ·ɪt/
to ​limit the ​food that you take, esp. in ​order to ​loseweight: He ​began dieting a ​month ago and says he has ​lost ten ​pounds already.
dieter
noun [C]  us   /ˈdɑɪ·ɪ·t̬ər/
Studies show there may be as many as 30 million American dieters at any one ​moment.

dietadjective [not gradable]

 us   /ˈdɑɪ·ɪt/
(of ​food or ​drink) ​containing much less ​sugar than ​usual and often sweetened ​artificially, or ​containing less ​fat than ​usual: diet ​soda
(Definition of diet from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "diet" - British English Dictionary

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dietnoun

uk   us   /ˈdaɪ.ət/
B1 [C or U] the ​food and ​drink usually ​eaten or ​drunk by a ​person or ​group: Diet ​varies between different ​countries in the ​world. a healthy/​balanced/​varied diet Rice is the staple diet (= most ​importantfood) of many ​people in ​China. The ​childrenseem to ​exist on a diet offriedfood.B1 [C] an ​eatingplan in which someone ​eats less ​food, or only ​particulartypes of ​food, because they ​want to ​becomethinner or for ​medicalreasons: I'm going on a diet next ​week and ​hope to ​lose ten ​pounds before ​Christmas. a crash/​strict/​calorie-controlled diet The ​doctor put me on a low-salt diet to ​reduce my ​bloodpressure. [S] a ​particulartype of thing that you ​experience or do ​regularly, or a ​limitedrange of ​activities: He was ​brought up on a diet ofpoliticalpropaganda from ​birth. Network TV only ​offers a diet ofbadrealityshows every ​night.
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dietadjective [before noun]

uk   us   /ˈdaɪ.ət/
Diet ​food or ​drinkcontains less ​sugar or ​fat than the ​usualtype, and often ​contains an ​artificial sweetener: diet ​cola

dietverb [I]

uk   us   /ˈdaɪ.ət/
to ​limit the ​food and/or ​drink that you have, ​especially in ​order to ​loseweight: You should be ​able to ​reduceyourweight by ​careful dieting.
(Definition of diet from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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“diet” in American English

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