noun
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a man who begins, secures financing for, and helps to organise an undertaking, as a business, venture, undertaking, etc.; a promoter.
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a man who incites another person to some evil action; an instigator.
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the fact of being engaged, employed in or occupied with (something).
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a pioneer or founder.
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he who decides, adjudges a litigation or law-suit; an arbitrator; a judge.