[ an-tahy, an-tee ]
/ ˈæn taɪ, ˈæn ti /

noun, plural an·tis.

a person who is opposed to a particular practice, party, policy, action, etc.


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Origin of anti

First recorded in 1780–90; by shortening of words prefixed with anti-

Definition for anti (2 of 2)


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-.

Origin of anti-

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 Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for anti

British Dictionary definitions for anti (1 of 2)

/ (ˈæntɪ) informal /


opposed to a party, policy, attitude, etche won't join because he is rather anti


an opponent of a party, policy, etc

British Dictionary definitions for anti (2 of 2)



against; opposinganticlerical; antisocial
opposite toanticlimax; antimere
rival; falseantipope
counteracting, inhibiting, or neutralizingantifreeze; antihistamine
designating the antiparticle of the particle specifiedantineutron

Word Origin for anti-

from Greek anti
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for anti



Opposing; against:antisocial.
Counteracting; neutralizing:antibody.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for anti


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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.