/ Dictionary / Index A aeronomy: Meaning and Definition of Find definitions for: ae•ron•o•my Pronunciation: (â-ron'u-mē), [key] — n. the study of chemical and physical phenomena in the upper atmosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. aeronautics aeropause Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language