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| arbitrary | 
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| a. Syn. capricious; impulse (任意) randomly chosen; determined by chance or impulse, and not by reason or principle | 
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| architect | 
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| n.  (建築) one who designs and supervises the construction of buildings or other large structures | 
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| arena | 
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| n.  (アリーナ) playing field where sports events take place; large structure for open-air sports or entertainments | 
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| aria | 
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| n. Syn. melody (アリア) operatic solo; solo vocal piece with instrumental accompaniment | 
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| arise | 
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| v. Syn. spring (発生) come up from a lower to a higher position; come above the horizon; spring up; come into action | 
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| armor | 
|     | 
| n. Syn. shield (鎧) shield; defensive covering, as of metal, wood, or leather, worn to protect the body against weapons | 
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| arms | 
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| n. Syn. weapon (武器) weapons considered collectively; official symbols of a family |