| arbiter | person with power to decide a matter in dispute; judge who is in a position ot make influential judgments; Ex. supreme arbiter of fashion in beachware |
| arbitrary | unreasonable or capricious; random; tyrannical; Ex. arbitrary ruler |
| arbitrate | act as judge (at the request of both sides) |
| arboreal | of or living in trees |
| arboretum | place where different trees and shrubs are studied and exhibited |
| arcade | a covered passageway usually lined with shops |
| arcane | esoteric; secret; mysterious; known only to the initiated; Ex. arcane ritual; Ex. arcane process closed to the uninitiated listener |
| arch- | chief; first; Ex. archbishop |
| archaeology | study of artifacts and relics of early mankind |
| archaic | antiquated; no longer used; belonging to the past; N. |
| archetype | prototype; primitive pattern |
| archipelago | group of closely located islands |
| archives | public records; place where public records are kept |
| ardor | heat; passion; zeal; ADJ. ardent |
| arduous | hard; strenuous; Ex. arduous work |
| argot | slang; speech spoken by only a small group of people |
| aria | operatic solo; a song sung by one person in an opera or oratorio |
| arid | (of land) dry; barren; unproductive |
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