as·sem·ble / əˈsembəl/ • v. 1. [intr.] (of people) gather together in one place for a common purpose: a crowd had assembled. ∎ [tr.] bring (people or things) together for a common purpose: he assembled the surviving members of the group for a tour. ∎ [usu. as n.] (assembling) Entomol. (of male moths) gather for mating in response to a pheromone released by a female.2. [tr.] fit together the separate component parts of (a machine or other object): a factory that assembled parts for trucks. ∎ Comput. translate (a program) from assembly language into machine code.