Breadcrumb Home > Dictionary > Index P parallactic motion: Meaning and Definition of Find definitions for: par'allac'tic mo'tion Pronunciation: [key] — Astron. Astron. the apparent motion of stars due to the earth's orbital motion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. parallactic ellipse parallax TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: feral Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language