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area a place or region. [3 definitions]
area code a set of three numbers given to different areas of the United States and Canada for telephone service. An area code must be dialed before the telephone number when calling someone outside a local area.
arena a stage, ring, or other enclosed area where shows or sports events are held. [3 definitions]
aren't shortened form of "are not" and of "am not."
Ares the god of war in Greek mythology. In Roman mythology, Ares is called Mars.
Argentina a country in southern South America. Buenos Aires is the capital of Argentina.
argue to give reasons for or against something. [3 definitions]
argument a discussion by people who disagree. [2 definitions]
arid extremely dry, especially from lack of rainfall.
Aries a constellation located between Pisces and Taurus. Aries is also called the Ram. [3 definitions]
arise to appear; come into being. [3 definitions]
aristocracy a class of people who have a high social position because of the family they are born into. Members of the aristocracy are usually richer and have more privileges than other members of society. [2 definitions]
aristocrat a member of the aristocracy; noble.
arithmetic the method and process of using whole numbers to add, subtract, multiply, and divide.
Arizona a state in the southwestern United States. Its capital is Phoenix. (abbreviated: AZ)
ark (sometimes capitalized) in the Bible, the large boat built by Noah to save his family and two of every animal from a flood sent by God. [2 definitions]
Arkansas a state in the south central United States. Its capital is Little Rock. (abbreviated: AR)
arm1 the part of the human body between the shoulder and the wrist. [2 definitions]
arm2 (usually plural) weapons. Guns, knives, and bombs are arms. [3 definitions]
armada a large group of ships armed for battle.
armadillo a mammal whose body is protected by hard, bony plates. Armadillos live in Central and South America, and the southern United States. Some kinds of armadillos are only six inches long; other kinds grow up to four feet in length. They eat mostly insects and are related to sloths and anteaters.