[an-tahy, an-tee]

noun, plural an·tis.

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

Origin of anti

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


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
Can be confusedante ante- anti- auntie Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for anti

Contemporary Examples of anti

Historical Examples of anti

  • Before the day is over we'll know which of our anti and neobiotics they like the least.

    Bolden's Pets

    F. L. Wallace

  • None of our anti or neobiotics or combinations of them have a positive effect.

    Bolden's Pets

    F. L. Wallace

  • I do hope she won't have a bad time with that Anti husband of hers!

    Rebel women

    Evelyn Sharp

  • Anti is the only one of us who has a chance of doing the job and surviving.

    Accidental Flight

    Floyd L. Wallace

  • Anti listened with him and waited until she could stand it no longer.

    Accidental Flight

    Floyd L. Wallace

British Dictionary definitions for anti



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


an opponent of a party, policy, etc



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

Word Origin and History for anti

as a stand-alone word, attested from 1788, originally in reference to the anti-federalists in U.S. politics (in the 1830s, of the Anti-Masonic party); as an adjective, from 1857. From anti- in various usages.


word-forming element meaning "against, opposed to, opposite of, instead," from Old French anti- and directly from Latin anti-, from Greek anti "against, opposite, instead of," also used as a prefix, from PIE *anti "against," also "in front of" (see ante). It appears in some words in Middle English but was not commonly used in word formations until modern times.

Online Etymology Dictionary, © 2010 Douglas Harper

anti in Medicine



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.

anti in Science


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.