Source : Free On-Line Dictionary of Computing

lvalue
     
         A reference to a location, an expression which
        can appear as the destination of an {assignment} operator
        indicating where a value should be stored.  For example, a
        variable or an array element are lvalues but the constant 42
        and the expression i+1 are not.  A constant string may or may
        not be an lvalue (it usually is in {C}).
     
        (1995-04-28)