Continuous Flow  Producing and moving one item at a time (or a small and consistent batch of items) through a series of processing steps as continuously as possible, with each step making just what is requested by the next step. Continuous flow can be achieved in a number of ways, ranging from moving assembly lines to manual cells. It also is called one-piece flow, single-piece flow, and make one, move one. 

Lean Lexicon 5th Edition  Edited by Chet Marchwinski (Lean Enterprise Institute, 2014) p. 11.