term:

Simulation

simulation n

in the civil law of Louisiana
1 : the act of simulating
2 : a contract that by mutual agreement does not express the true intent of the parties see also counterletter compare disguised donation at donation NOTE: Although a simulation does not have effect as between the parties, its lack of effect may not be asserted against third parties, such as creditors or bona fide purchasers, to avoid liability.

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.