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Aristotle a Greek philosopher (384-322 B.C.).
arithmetic the simplest form of mathematics consisting of the theory and computation of whole numbers, including addition, subtraction, multiplication, division, evolution, and involution. [3 definitions]
arithmetician one skilled in arithmetic.
arithmetic mean the sum of a series of quantities divided by the number of quantities; average.
arithmetic progression a sequence of numbers that results from adding a constant number, such as 4, to each previous number, and thus obtaining a series such as 6, 10, 14, 18, 22, 26.
-arium a place or device associated with or pertaining to; -orium.
Arius a Greek theologian and Christian priest in Alexandria (256?-336 A.D.).
Arizona a southwestern U.S. state between California and New Mexico. (abbr.: AZ)
ark (sometimes cap.) according to the Old Testament, a large boat built by Noah to preserve life during the Flood. [4 definitions]
Arkansas a south central U.S. state between Mississippi and Oklahoma. (abbr.: AR)
ark of the covenant according to the Old Testament, the sacred chest in which the ancient Hebrews carried the two stone tablets inscribed with the Ten Commandments.
arm1 either of the two upper limbs of the human body, between the shoulders and the wrists. [3 definitions]
arm2 (usu. pl.) weapons, esp. those that shoot or explode. [7 definitions]
armada a fleet of armed ships. [2 definitions]
armadillo a burrowing nocturnal mammal of the southern United States and South America, whose body is armored by jointed, bony plates.
Armageddon according to the New Testament, the place where the final, decisive conflict between good and evil will be fought. [2 definitions]
armament weapons and supplies used to equip a military unit such as a tank, warship, airplane, or the like. [4 definitions]
armature a coil-wrapped iron core that rotates in a magnetic field to induce electrical current in a generator, or that produces motion in an electrical motor when current is passed through it. [4 definitions]
armband a cloth band worn around the upper arm as a badge of rank, membership, or the like, or as a symbol, as of mourning.
armchair a chair having supports at the sides for resting one's arms. [2 definitions]
armed holding or bearing weapons. [4 definitions]