| 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] |