exculpation

n : the act of freeing from guilt or blame

emulation

One system is said to emulate another when it performs in

exactly the same way, though perhaps not at the same speed. A

typical example would be emulation of one computer by (a

program running on) another. You might use an emulation as a

replacement for a system whereas you would use a simulation if

you just wanted to analyse it and make predictions about it.

(1995-05-12)