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arctic (often capitalized) of or having to do with the region around the North Pole. [3 definitions]
Arctic Circle an imaginary line drawn around the earth parallel to the equator which marks the boundary of the Arctic. North of this line there are periods of continuous night in the winter and continuous day in the summer.
Arctic Ocean the ocean that surrounds the North Pole.
-ard a suffix that means one who does something too much or too often.
ardent having or showing very strong feelings such as passion, loyalty, or desire.
are1 a form of the verb be that is present tense and used with the pronouns "you," "we," or "they." It is also used with plural nouns.
area a place or region. [3 definitions]
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)