The Free On-line Dictionary of Computing (30 December 2018):

aliasing
shadowing

   1.  When several different identifiers refer to the
   same object.  The term is very general and is used in many
   contexts.

   See alias, aliasing bug, anti-aliasing.

   2.  (Or "shadowing") Where a hardware device
   responds at multiple addresses because it only decodes a
   subset of the address lines, so different values on the
   other lines are ignored.

   (1998-03-13)