CONSOLIDATION, civil law. The union of the usufruct with the estate out of which it issues, in the same person which happens when the usufructuary acquires the estate, or vice versa. In either case the usufruct is extinct. In the common law this is called a merger. Ley. El. Dr. Rom. 424. U. S. Dig. tit. Actions, V. 2. Consolidation may take place in two ways: first, by the usufructuary surrendering his right to the proprietor, which in the common law is called a surrender; secondly, by the release of the. proprietor of his rights to the usufructuary, which in our law is called a release.