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) |