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| authentic | 
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| a. Syn. genuine; real; valid; trustworthy not counterfeit or copied; valid; trustworthy | 
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| automatic | 
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| a. Syn. automated; mechanized; involuntary mechanized; operating with minimal human intervention; independent of external control | 
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| automation | 
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| n.  act or process of converting the controlling of a machine or device to a more automatic system, such as computer or electronic controls | 
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| autonomy | 
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| n. Syn. independence; liberty independence; self-government or the right of self-government; self-determination | 
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| avail | 
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| v. Syn. profit; promote turn to advantage of; be of service to; profit; promote | 
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| aviation | 
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| n. Syn. flying; flight; aeronautics art or science of flying; flight; aeronautics |