Semantic Environment
A Semantic Environment is the resolved set of Core version, governed context, active Domain Packs, mappings, shapes, and other semantic artifacts under which an operation is interpreted.
Specification-sourced: quoted from the governing specification, pending the applicable specification-owner approvals. The specification controls.
In plain words
Consequential semantic processing should be reproducible against an identifiable Semantic Environment. A derived result that depends on a Domain Pack names the pack version or environment it was produced under, so later vocabulary changes do not silently alter its meaning.