Informal a person opposed to some policy, proposal, action, etc.
Origin: ; from anti-, in various compounds
Informal opposed to; against
against, hostile to, opposed to: antilabor, antislavery
that counteracts, that operates against: antiaircraft
that prevents, cures, or neutralizes: antitoxin
opposite, reverse: antiperistalsis
having the superficial aspect, but not the usual characteristics, of: antihero
Origin: Classical Greek anti-, ant- ; from anti, against ; from Indo-European an unverified form anti, facing, opposite, near (from source Classical Latin ante, opposite, before) ; from base an unverified form ant-s, front, forehead
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.