Pronunciation: (mī'kru-mō"shun), [key]
1. a motion, esp. a periodic one, of very short duration or length.
2. (in time and motion study) the analysis of the time of a work performance in its basic subdivisions with the aid of a timing apparatus, motion-picture equipment, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.