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Aries an autumn zodiacal constellation located between Pisces and Taurus; Ram. [3 definitions]
aright so as to be right; correctly.
aril a second or outer covering of some seeds.
arioso in the manner of an aria or song (used as a musical direction). [3 definitions]
arise to come into view or existence; emerge. [4 definitions]
arista a bristlelike appendage on the spikelets of certain grains and grasses; awn. [2 definitions]
aristocracy a high-ranking social class, having special privileges and influence and usu. determined by heredity. [5 definitions]
aristocrat a member of a titled or privileged class. [3 definitions]
aristocratic of or concerning aristocrats or government by aristocrats. [2 definitions]
Aristotelian of, concerning, or derived from Aristotle or his philosophy. [3 definitions]
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.