Found:

Fixed-context assumption

SEMANTICS: the simplifying assumption often made in model-theoretic semantics that one particular context is chosen for the interpretation of context dependent expressions, which does not change in the course of the interpretation process. This assumption is dropped in those semantic frameworks that interpret expressions in terms of their potential to change the context.

LIT.	Barwise, J. & R. Cooper (1981) Chierchia and McConnell-Ginet (1990)