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A special kind of variable, used in a subroutine to refer to one of the pieces of data provided as input to the subroutine. The semantics for how parameters can be declared and how the arguments get passed to the parameters of subroutines are defined by the language, but the details of how this is represented in any particular computer system depend on the calling conventions of that system.
resources.data.gov
An official website of the Office of Management and Budget, the General Services Administration, and the Office of Government Information Services.