/ Dictionary / Index S synchronous machine: Meaning and Definition of Find definitions for: syn'chronous machine' Pronunciation: [key] — Elect. Elect. an alternating-current machine in which the average speed of normal operation is exactly proportional to the frequency of the system to which it is connected. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. synchronous converter Synchronous Meteorological Satellite Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language