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declaration. n. 1. (Rhetoric) an explicit or emphatic statement. 2. (Rhetoric) a formal statement or announcement; proclamation. 3. (Rhetoric) the act of declaring.
The function declaration defines its parameters. A parameter is a variable which takes on the meaning of a corresponding argument passed in a call to a function. An argument represents the value you supply to a function parameter when you call it. The calling code supplies the arguments when it calls the function.