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Noun
  1. A person authorized to act for another (synset 110506494)
    is a type of: agent - a representative who acts on behalf of other persons or organizations
    same as: procurator, proxy
  2. A symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set (synset 107286183)
    is a type of: variable - a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity

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