 Key to the distinction between an idiolect and a social language is the fact that the same natural language, L, can be picked out in either of two ways: L as the language with specified linguistic (semantic, syntactic, phonological, etc.) properties, or L as the language possessed (spoken, etc.) by a specific individual or population. French, for example, is the language containing an adjective, rouge, that refers to the color red and in its spoken form begins with a voiced uvular fricative, etc. But French is also the first language of most residents of France, the lingua franca of Côte d’Ivoire, the medium in which Simone de Beauvoir wrote, spoke, and thought, etc.