ar

arable (adj.) suitable for growing crops (The farmer purchased a plot of arable land on which he will grow corn and sprouts.)

arbiter (n.) one who can resolve a dispute, make a decision (The divorce court judge will serve as the arbiter between the estranged husband and wife.)

arbitrary (adj.) based on factors that appear random (The boy’s decision to choose one college over another seems arbitrary.)

arbitration (n.) the process or act of resolving a dispute (The employee sought official arbitration when he could not resolve a disagreement with his supervisor.)

arboreal (adj.) of or relating to trees (Leaves, roots, and bark are a few arboreal traits.)

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arcane (adj.) obscure, secret, known only by a few (The professor is an expert in arcane Lithuanian literature.)

archaic (adj.) of or relating to an earlier period in time, outdated (In a few select regions of Western Mongolian, an archaic Chinese dialect is still spoken.)

archetypal (adj.) the most representative or typical example of something (Some believe George Washington, with his flowing white hair and commanding stature, was the archetypal politician.)

ardor (n.) extreme vigor, energy, enthusiasm (The soldiers conveyed their ardor with impassioned battle cries.)

arid (adj.) excessively dry (Little other than palm trees and cacti grow successfully in arid environments.)

arrogate (v.) to take without justification (The king arrogated the right to order executions to himself exclusively.)

artifact (n.) a remaining piece from an extinct culture or place (The scientists spent all day searching the cave for artifacts from the ancient Mayan civilization.)

artisan (n.) a craftsman (The artisan uses wood to make walking sticks.)