[an-tahy, an-tee]
noun, plural antis.
a person who is opposed to a particular practice, party, policy, action, etc.

1780–90; by shortening of words prefixed with anti- Unabridged


a prefix meaning “against,” “opposite of,” “antiparticle of,” used in the formation of compound words (anticline ); used freely in combination with elements of any origin (antibody; antifreeze; antiknock; antilepton ).
Also, before a vowel, ant-.

Middle English < Latin < Greek, prefixal use of antí; akin to Sanskrit ánti opposite, Latin ante, Middle Dutch ende (> Dutch en and), English an- in answer. Cf. ante-, and

ante, ante-, anti-, auntie. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
anti (ˈæntɪ)
1.  opposed to a party, policy, attitude, etc: he won't join because he is rather anti
2.  an opponent of a party, policy, etc

1.  against; opposing: anticlerical; antisocial
2.  opposite to: anticlimax; antimere
3.  rival; false: antipope
4.  counteracting, inhibiting, or neutralizing: antifreeze; antihistamine
5.  designating the antiparticle of the particle specified: antineutron
[from Greek anti]

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

L. anti- from Gk. anti "against, opposite, instead of," from PIE *anti (see ante).

as a stand-alone word, attested from 1788 (n.), originally in ref to the anti-federalists in U.S. politics (in the 1830s, of the Anti-Masonic party); as an adj., from 1857. From anti- in various usages.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

anti- or ant-

  1. Opposite: antimere.

  2. Opposing; against: antisocial.

  3. Counteracting; neutralizing: antibody.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
A prefix whose basic meaning is "against." It is used to form adjectives that mean "counteracting" (such as antiseptic, preventing infection). It is also used to form nouns referring to substances that counteract other substances (such as antihistamine, a substance counteracting histamine), and nouns meaning "something that displays opposite, reverse, or inverse characteristics of something else" (such as anticyclone, a storm that circulates in the opposite direction from a cyclone). Before a vowel it becomes ant-, as in antacid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Anti matter is, the same matter existing in different moments of time.
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