One number, eight definitions.
Retrieval-augmented models answer the same labor-cost question four different ways in one session, because each POS, payroll, and BI export encodes "labor" against a different schema. The model has no shared ontology to reconcile them; it picks whichever document ranks highest and presents the contradiction as a confident average.
A single atomic definition for every measure, with the math of how it composes. One question has one defensible answer across every unit.