1. <jargon> 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. <hardware> (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.
ALGY « ALIAS « alias « aliasing » aliasing
bug » Alice » alife