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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 & symbol in a C++ variable declaration means it's a reference. It happens to be a reference to a pointer, which explains the semantics you're seeing; the called function can change the pointer in the calling context, since it has a reference to it.