/ Dictionary / Index S sensible horizon: Meaning and Definition of Find definitions for: sen'sible hori'zon Pronunciation: [key] — Astron. Astron. See under(def. 2a). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sensible sensillum Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language