Breadcrumb Home > Dictionary > Index X xi: Meaning and Definition of Find definitions for: xi Pronunciation: (zī, sī Gk. ksē), [key] — pl. xis. the 14th letter of the Greek alphabet (&Xgr;, &xgr;). the group of consonant sounds represented by this letter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: xi (Thesaurus) Xhosa Xia TrendingHere are the facts and trivia that people are buzzing about. The Book of Philippians: Summary Current Events This Week: May 2023 Preamble of the United Nations Charter Queen Victoria Books of the Bible: New Testament Books in Order The 88 Recognized Constellations ✖ Related Content Daily Word Quiz: panache Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language