/ Dictionary / Index S Seleucus I: Meaning and Definition of Find definitions for: Seleucus I Pronunciation: [key] (Seleucus Nicator) 358?–281? b.c.,Macedonian general under Alexander the Great: founder of the Seleucid dynasty. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Seleucus self Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language