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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.
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]