Sentence:  A variable's <WSD>scope</WSD> is the region of a program within which the variable can be referred to by its simple name. Secondarily, <WSD>scope</WSD> also determines when the system creates and destroys memory for the variable. <WSD>Scope</WSD> is distinct from visibility, which applies only to member variables and determines whether the variable can be used from outside of the class within which it is declared. 
Meaning of the word marked with <WSD> tags:  The region of program source code in which a given identifier is meaningful, or a given object can be accessed.