Breadcrumb Home > Dictionary > Index S second unit: Meaning and Definition of Find definitions for: sec'ond u'nit Pronunciation: [key] — Motion Pictures. Motion Pictures. an additional crew on a film production, usually used at a second location for filming crowd scenes, exteriors, and other shots that do not require the principal actors. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. second thought Second Vatican Council TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: quisling Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language