/ Dictionary / Index A Addison: Meaning and Definition of Find definitions for: Ad•di•son Pronunciation: (ad'u-sun), [key] — n. 1672–1719, English essayist and poet. 1793–1860, English physician. a town in NE Illinois. 28,836. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Addis Ababa Addisonian 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