Breadcrumb Home > Dictionary > Index O OGO: Meaning and Definition of Find definitions for: OGO Pronunciation: [key] — U.S. Aerospace. U.S. Aerospace. Orbiting Geophysical Observatory: one of a series of scientific satellites that studied sun-earth relationships and the earth's atmosphere, ionosphere, and magnetosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ogmios ogonek TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language