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| architect | 
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| n.  one who designs and supervises the construction of buildings or other large structures | 
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| ardent | 
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| a. Syn. intense; passionate; zealous displaying or by strong enthusiasm or devotion; passionate | 
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| arena | 
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| n.  playing field where sports events take place; large structure for open-air sports or entertainments | 
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| arise | 
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| v. Syn. spring come up from a lower to a higher position; come above the horizon; spring up; come into action | 
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| armour | 
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| n.  defensive covering, as of metal, wood, or leather, worn to protect the body against weapons | 
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| arouse | 
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| v. Syn. excite; stimulate; awake excite; stimulate; awaken from or as if from sleep | 
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| articulate | 
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| a. Syn. effective; distinct expressing oneself easily in clear and effective language | 
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| artillery | 
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| n.  large weapons, such as cannon and missile launchers operated by crews; branch of army in use of large weapons | 
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| ascertain | 
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| v. Syn. discover; insure find out for certain; discover with certainty; make sure of | 
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| ascribe | 
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| v. Syn. refer; attribute; assign inscribe or dedicate; attribute to a specified cause, source, or origin; assign as a quality |