assembly UK /əˈsɛmb.lɪ/US /əˈsɛmb.li/ noun7 •a group of people who have come together in one place for a shared purpose •A legislative body. •The act or process of putting together a set of pieces, fragments, or elements.The bogies are built up of welded sub-units which are stress-relieved before assembly by riveting. — 1961 •A set of pieces that work together in unison as a mechanism or device.In order to change the bearing, you must first remove the gearbox assembly. •Ellipsis of assembly language. •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 beat of the drum or sound of the bugle as a signal to troops to assemble. formsassemblies