As the concept of meta-classes was introduced in order to permit the manipulation of classes, we introduce the concept of meta-components, meta-connectors, and metaarchitectures to permit the manipulation and the redefinition of architectural elements (structural and behavioral). In this article we present a meta-metaarchitecture called MADL (Meta Architecture Description Language) to abstract the notions of architectures (components, connectors, architectures), hence to facilitate their manipulation, reuse, and evolution; and also to ease (hence encourage) the transformation and comparison among ADLs.