What is Modular? What is Modular Construction?  The term modular basically refers to one of the operational parts of a given system. The word comes from the Latin root ‘modulus’ and means ‘measure’ or ‘part’. Used in a wide range of contexts, from technology to architecture, modular often represents smaller, autonomous units of a larger system. For example, in a software system, a modular may be a piece of code that fulfils a specific function, while in a machine it may refer to a removable and replaceable part. Modular construction brings the modular logic to the building and construction more..