Assembly meaning : A set of pieces that work together in unison as a mechanism or device. The act of putting together a set of pieces, fragments, or elements. A congregation of people in one place for a purpose. A legislative body. A beat of the drum or sound of the bugle as a signal to troops to assemble. In Microsoft .NET, a building block of an application, similar to a DLL, but containing both executable code and information normally found in a DLL's type library. The type library information in an assembly, called a manifest, describes public functions, data, classes, and version information. A programming language in which the source code of programs is composed of mnemonic instructions, each of which corresponds directly to a machine instruction for a particular processor.