Dialect levelling is an overall reduction in the variation or diversity of a dialect's features when in contact with one or more other dialects. This can come about through assimilation, mixture, and merging of certain dialects, often amidst a process of language codification, which can be a precursor to standardization. One possible result is a koine language, in which various dialects mix together and simplify, settling into a new and more widely embraced form of the language. Another possible path is that a speech community increasingly adopts or exclusively preserves features with widespread social currency at the expense of their more local or traditional dialect features.