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From The Free On-line Dictionary of Computing (27 SEP 03) : [ foldoc ]
formal argument
(Or "parameter") A name in a function or
subroutine definition that is replaced by, or bound to, the
corresponding actual argument when the function or
subroutine is called. In many languages formal arguments
behave like local variables which get initialised on entry.
See: argument.
(2002-07-02)