Real Dictionary

assembly line
countable noun: An assembly line is an arrangement of workers and machines in a factory, where each worker deals with only one part of a product. The product passes from one worker to another until it is finished.

assembly line in American English
in many factories, an arrangement whereby each worker performs a specialized operation in assembling the work as it is passed along, often on a slowly moving belt or track
noun: an arrangement of machines, tools, and workers in which a product is assembled by having each perform a specific, successive operation on an incomplete unit as it passes by in a series of stages organized in a direct line

assembly line in British English
noun: a sequence of machines, tools, operations, workers, etc, in a factory, arranged so that at each stage a further process is carried out

assembly line in Mechanical Engineering
noun: An assembly line is an arrangement of workers and machines in a factory, where each worker deals with only one part of a product. The product passes from one worker to another until it is finished.