What does the word gearing mean?

Usage examples for gearing

  1. To make alterations while the machine is in motion, or to introduce new combinations, however ingenious, into any part of the original plan, might produce an accident or a breakage of the gearing when perhaps it would be least expected. – History Of Egypt, Chaldæa, Syria, Babylonia, and Assyria, Volume 5 (of 12) by G. Maspero