Breadcrumb Home > Dictionary > Index S semi: Meaning and Definition of Find definitions for: sem•i Pronunciation: (sem'ē, sem'ī), [key] — n. Informal. semitrailer (def. 1). Often,semifinal (def. 3). semi- Pronunciation: [key] a combining form borrowed from Latin, meaning “half,” freely prefixed to English words of any origin, now sometimes with the senses “partially,” “incompletely,” “somewhat”: semiautomatic; semidetached; semimonthly; semisophisticated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: semi (Thesaurus) semester hour semi-abstract TrendingHere are the facts and trivia that people are buzzing about. Who's Who in the "Lord of the Rings" Roman Catholic Church Hierarchy Current Events This Week: March 2023 42 Top Western Movie Quotes Slaves in the Family User's Guide to Environmental Language ✖ Related Content Daily Word Quiz: tangential Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language