Breadcrumb Home > Dictionary > Index S so long: Meaning and Definition of Find definitions for: so" long' Pronunciation: [key] — Informal. Informal. good-bye: I said so long and left. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Solon Solothurn TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: radula Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language