According to the neogrammarians and de Saussure, all linguistic change is either sound change, analogy, or borrowing.1 Meillet (1912) identified a class of changes that don’t fit into any of these three categories. Like analogical changes, they are endogenous innovations directly affecting morphology and syntax, but unlike analogical changes, they are not based on any pre-existing patterns in the language. Meillet proposed that they represent a fourth type of change, which he called GRAMMATICALIZATION. Its essential property for him was that (...) it gives rise to new grammatical categories — that is, to categories previously unexpressed in the language — and thereby transforms its overall system. (shrink)