The term "make-ready" refers to everything done on a press to prepare for the final print job. This includes selecting the proper colors, getting the image placement correct, setting up the plates, and preparing the printer for the chosen paper size and weight. Getting everything right during make-ready helps to ensure a quality print run. This step would be considered finished when the printer is satisfied with a print, and can therefore begin the actual run.
David Bann. “The All New Print Production Handbook.” Watson-Guptill Publications. 2006.