of or pertaining to diet: a dietary cure.
noun, plural dietaries.
a regulated allowance of food.
Obsolete. a system or course of diet.

1400–50; late Middle English dietarie system of diet. See diet1, -ary

dietarily, adverb
predietary, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dietary (ˈdaɪətərɪ, -trɪ)
1.  of or relating to a diet
n , -taries
2.  a regulated diet
3.  a system of dieting

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1610s, from L. diaetarius, from diaeta (see diet (1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dietary di·e·tar·y (dī'ĭ-těr'ē)
Of or relating to diet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
His level elaborate teeth suggest a largely vegetarian dietary.
We can not afford, in the strictest view of dietary responsibility, to quarrel
  with them for it.
What wine tasting taught me about the dietary preferences of deer.
One would have to be an ideologue of the highest order to hear that as a
  question about dietary choice.
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