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| audience | 
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| n. Syn. spectator; viewer (視聴者) a group of people within hearing; crowd seeing a stage performance | 
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| audition | 
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| v. Syn. test (オーディション) take part in a trial performance; evaluate in a trial performance | 
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| aurora | 
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| n.  (オーロラ) the first light of day; an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force | 
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| authentic | 
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| a. Syn. genuine; real; valid; trustworthy (本格的) not counterfeit or copied; valid; trustworthy | 
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| autobiographical | 
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| a.  (自伝) of or relating to a person's life or an account of a person's life | 
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| automated | 
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| a. Syn. mechanical; automatic (自動化) mechanical; automatic; accomplished without the intervention of a human operator | 
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| automatic | 
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| a. Syn. automated; mechanized; involuntary (自動) mechanized; operating with minimal human intervention; independent of external control | 
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| automotive | 
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| a.  (自動車) of or relating to motor vehicles; moving by itself; self-propelling | 
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| autonomous | 
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| a.  (独裁) self-governing; not controlled by others or by outside forces; independent |