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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.
For variables, definitions assign values to an area of memory that was reserved during the declaration phase. For functions, definitions supply the function body. While a variable or function may be declared many times, it is typically defined once (in C++, this is known as the One Definition Rule or ODR).