a person who does not eat or does not believe in eating meat, fish, fowl, or, in some cases, any food derived from animals, as eggs or cheese, but subsists on vegetables, fruits, nuts, grain, etc.
of or pertaining to vegetarianism or vegetarians.
devoted to or advocating this practice.
consisting solely of vegetables: vegetarian vegetable soup.

1835–45; veget(able) + -arian

nonvegetarian, adjective, noun

vegan, vegetarian. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vegetarian (ˌvɛdʒɪˈtɛərɪən)
1.  a person who advocates or practises vegetarianism
2.  relating to, advocating, or practising vegetarianism
3.  cookery strictly, consisting of vegetables and fruit only, but usually including milk, cheese, eggs, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1839, irregular formation from vegetable (n.) + -arian, as in agrarian, etc. "The general use of the word appears to have been largely due to the formation of the Vegetarian Society in Ramsgate in 1847."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

vegetarian veg·e·tar·i·an (věj'ĭ-târ'ē-ən)
One who practices vegetarianism. adj.

  1. Of or relating to vegetarianism or vegetarians.

  2. Consisting primarily or wholly of vegetables and vegetable products.

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
Stop eating is not a solution, becoming a vegetarian maybe.
Vegetarian restaurants are spreading, but many patronise them to be trendy
  rather than ethical.
The same happened to my partner, who also underwent the gradual, instinctive
  change from carnivore to vegetarian.
Doesn't matter if you buy your food at the store or hunt and fish or even if
  you are a vegetarian.
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