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English Thesaurus

1. a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set (noun.communication)

hypernym	:	variable,
definition	:	a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity (noun.communication)

2. a person authorized to act for another (noun.person)

hypernym	:	agent,
definition	:	a representative who acts on behalf of other persons or organizations (noun.person)