This article provides of synthesis of studies on the concept and the practices of "the dynamics of the language".

First, it analyses the concept, from the point of view of the power dynamics. It focuses on different facets of power relations: the assets, the status and the functions of a language within its own social ecology.

Next, the article examines these forces within a spatial and temporal framework: their nature, their importance and their duration. It also discusses the means of measuring two spatial and temporal vectors: intensity and velocity.

Thirdly, the article examines the effects of these forces on the usage of spoken and written language through the linguistic behaviour of specific populations.

Fourthly, the article describes the self-regulatory devices built within the norms of intercommunication through successive adaptations to the forces which determine the status of a language.

Lastly, examples drawn from the lived experiences in a variety of vernacular and supranational languages are given.