Emulation
Dictionary Definition
Committee Definition
A system used to mimic another system - usually a computer system with used for interface
Domain Specific Usage
Engineering and Biomedical (NASA): The use of an M&S to imitate another system, so that the M&S behaves like or appears to be the other system.1
Notes
from NASA STANDARD FOR MODELS AND SIMULATIONS – https://standards.nasa.gov/documents/detail/3315599. (1)