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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.
defining a function is where you actually provide a definition (what the function actually does) between { } like so: //this is a definition int addTwo(int a, int b) { return a + b }. declaring a function is simply telling the compiler about the function. You let it know it exist by providing the name, the return type, and the number of / type of arguments.