/ Dictionary / Index E escapement error: Meaning and Definition of Find definitions for: escape'ment er"ror Pronunciation: [key] — Horol. Horol. loss of isochronism in the movement of a pendulum as a result of its relation to the escapement. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. escapement escape velocity Related Content Daily Word Quiz: pertinent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language