# Semantic Drift **Domain:** Semantics / Knowledge Architecture / Corpus Governance **Doc Type:** Canonical Concept Node **Maturity:** Developed ## Definition **Semantic drift** is the gradual change or divergence of meaning across time, contexts, communities or documents. In an ontologically governed corpus, it occurs when the same term acquires incompatible local meanings, when neighboring concepts collapse into one another or when usage moves away from a canonical definition without an explicit ontological revision. This corpus-governance usage is related to but narrower than diachronic semantic change in linguistics. Natural languages legitimately change. The governance problem arises when unnoticed change makes claims inside the same knowledge system difficult to compare or causes one link target to conceal several incompatible concepts. ## Detection Possible indicators include: - one term carrying incompatible inclusion criteria in different articles; - several terms performing the same conceptual work without a meaningful distinction; - links whose surrounding claims conflict with the destination definition; - an established relation repeatedly contradicted by new cases; - definitions broadened locally to support an argument without recording the change. These signals do not prove that an article is wrong. Repeated conflict may show that the ontology itself has become inadequate and requires [[wiki/Ontology Evolution|Ontology Evolution]]. ## Relation to Elasticity [[wiki/Semantic Elasticity|Semantic Elasticity]] permits governed movement. Semantic drift is movement whose boundary, justification or consequence has not been made explicit. [[wiki/Semantic Governance|Semantic Governance]] distinguishes productive extension from destabilizing divergence. ## Key Insight **The danger is not that meanings change; it is that they change invisibly while the graph continues pretending they are identical.** ## Sources / Provenance - Connected to the vault's ontology-governance problem in [[journal/2026-08-15 - Bidirectional Ontology and Semantic Elasticity|2026-08-15 — Bidirectional Ontology and Semantic Elasticity]]. - The term also has established uses in historical linguistics, distributional semantics and model analysis; those uses should not be collapsed automatically into this corpus-specific application. ## See Also [[wiki/Semantic Elasticity|Semantic Elasticity]], [[wiki/Semantic Governance|Semantic Governance]], [[wiki/Bidirectional Ontology|Bidirectional Ontology]], [[wiki/Ontology Evolution|Ontology Evolution]], [[wiki/Epistemic Status Separation|Epistemic Status Separation]], [[wiki/Provenance|Provenance]]