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arbitrary resulting from personal opinions, wishes, or feelings instead of from a rule or reason.
arbitrate to make a decision about or settle. [2 definitions]
arbor1 a shady area made by arranging trees and bushes or by growing vines on a frame.
arbour a spelling of arbor used in Canada and Britain. See arbor for more information.
arc any curved line; anything shaped like a bow or curve.
arcade a row of arches connected to form a passageway. [2 definitions]
arch1 a curved structure made out of stone or brick and used to span an open space such as a door. [4 definitions]
arch- a prefix that means "main" or "most important."
archaeology the study of past human life. An archaeologist digs up and then studies objects such as pottery, tools, and buildings.
archbishop a bishop of the highest rank.
archeology another spelling for archaeology.
archer a person who uses a bow and arrow.
archery the sport or practice of shooting with a bow and arrow.
archipelago a group of islands.
architect a person who designs buildings and directs their construction.
architecture the act or process of designing buildings, or the profession of an architect. [2 definitions]
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.