What is the meaning of Assembly?

A set of pieces that work together in unison as a mechanism or device.

The act or process 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.

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.

assembly language (programming language using mnemonics that correspond to processor instructions)

Source: wiktionary.org