/ Dictionary / Index E ephemeris time: Meaning and Definition of Find definitions for: ephem'eris time" Pronunciation: [key] — Astron. Astron. time measured by the orbital movements of the earth, the moon, and the planets. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ephemeris second ephemeron Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language