/ Dictionary / Index D Demetrius I: Meaning and Definition of Find definitions for: De•me•tri•us I Pronunciation: (di-mē'trē-us) [key] — (Poliorcetes) 337?–283 b.c., king of Macedonia 294–286 (son of Antigonus I). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Demetrias demi- Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language