The process by which a provisional formulation becomes increasingly resistant to revision because repetition, citation and institutional use have raised the cost of reopening it. SemanticHardening names a transition rather than a static property: something changes in the relation between language, material, institution and use. The operator is therefore strongest when it is applied to a process that can be observed over time, not merely attached as a decorative label. Across these domains, the same structural question returns: how does a weak, provisional or dispersed condition become durable enough to organize later action? It does not mean that meaning has become permanently fixed. It means that the social willingness and institutional capacity to question a formulation have diminished. This distinction prevents the operator from dissolving into a familiar neighboring concept. A useful operator must permit disagreement about whether a particular case qualifies, which means that its boundary should remain clear enough to resist indiscriminate use. The central danger is that a useful description can become an invisible rule governing what evidence is noticed and which alternatives remain speakable. The operator is not valuable because every case is harmful or beneficial, but because it identifies the precise moment at which a productive capacity can turn into a form of constraint. Its critical force lies in making that passage visible before it becomes naturalized. A practical test is simple: ask whether the term continues to be used because it remains adequate, or because too many practices now depend upon it. The answer should be grounded in observable relations, documentary traces, repeated behavior or material consequences rather than intuition alone. Used carefully, SemanticHardening can move among disciplines without becoming vague. It names one recurring mechanism at different scales: the phrase, the archive, the building, the platform, the institution or the field. Its portability is not metaphorical looseness. It is the recognition that heterogeneous systems can share an operational structure while retaining their material differences. Anto Lloveras · LAPIEZA-LAB · Madrid · 2026