('chiefly Brit') This is a modular course of three components, and students can take those three 'modules' in any order.
factories that build engines, transmissions, brakes, and other 'modules' for cars
the spacecraft's 'command module' [=the main part of a spacecraft]
(..) on all decks. I want you to communicate and keep in touch at all times, all right? Let's go. I thought you fixed module. We did. I don't understand it. The circuits must have burned out. - What do we got here? (..)1979 Alien