Refers to organized systems of symbols, ideas, explanations, beliefs, and material production that humans create and manipulate in the course of their daily lives. Includes the customs by which humans organize their physical world and maintain their social structure. More recent approaches recognize that they are not static, homogenous or bounded but dynamic and fluid. Refers to the shared social construction of meanings, but simultaneously is often a site of contested meanings. These recent formulations of the concept recognize that it may be the subject of disagreement and conflict within and among societies, and this disagreement may include the definition itself