/ 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 Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language