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Children's Dictionary
abolitionism a movement in the United States in the 1800s whose goal was to free the people who were slaves and make slavery against the law.
adversary a person, group, or thing that is against another; opponent; enemy.
ageism the act of having a bad opinion of, or not treating in a fair way, a person or group of people based on age. This kind of discrimination is often against older people.
aggression an attack or war against a country started without good cause by another country. [2 definitions]
agitate to try to stir up public support (often followed by "for" or "against"). [1/3 definitions]
alibi a way of defending oneself against criminal charges by showing that one was not at the scene of the crime when it happened. [1/2 definitions]
antagonism a state of being enemies, or a strong feeling against someone or something.
antagonist a person who fights against another; an enemy or competitor. [2 definitions]
anti- a prefix that means "against" or "opposed to." [1/2 definitions]
antibody a protein in blood that reacts to particular toxic substances by neutralizing or destroying them. Antibodies provide immunity against these toxic substances.
antitoxin an antibody formed in the body to act against a specific poison.
argue to give reasons for or against something. [1/3 definitions]
argument a reason in favor of or against something. [1/2 definitions]
armor a covering placed on ships and vehicles that protects against weapons. [2/4 definitions]
attack to speak or write against; oppose. [1/5 definitions]
ban1 to forbid or have an official rule against; prohibit. [1/2 definitions]
battle to fight or struggle against. [1/4 definitions]
beat to win against; defeat. [1/9 definitions]
billiards a game played with long sticks and hard balls on a special table covered with cloth. Players use a stick to hit the balls against each other and into pockets along the edges of the table.
booster shot an injection of a vaccine given at some time after the first injection. A booster shot continues the protection against disease begun by the earlier injection.
bounce to cause to hit against something and spring back. [1/4 definitions]