[mahy-kruh-moh-shuh n]
  1. a motion, especially 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.

Origin of micromotion

First recorded in 1910–15; micro- + motion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018