Webster's English Dictionary

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diet

1. di.et \'di--*t\ n [ME diete, fr. OF, fr. L diaeta prescribed diet, fr. 
   Gk, lit., mann]er of living, fr. dia- + -aita (akin to Gk aisa share) 1a: 
   food and drink regularly provided or consumed  1b: habitual course of 
   feeding  1c: a prescribed course or allowance of food  2: something 
   provided esp. habitually (as for use or enjoyment) 
2. diet vt 1: to cause to take food : FEED  2: to cause to eat and drink 
   sparingly or according to prescribed rules  : to eat sparingly or according 
   to prescribed rules  - di.et.er n
3. diet n [ML dieta, day's journey, assembly, fr. L dies day - more at 
   D]IETY 1: a formal deliberative assembly of princes or estates  2: any of 
   various national or provincial legislatures