Breadcrumb Home > Dictionary > Index C C.A.S.: Meaning and Definition of Find definitions for: C.A.S. Pronunciation: [key] Certificate of Advanced Studies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cas (Thesaurus) caryopsis casa TrendingHere are the facts and trivia that people are buzzing about. Animal Group Terminology Largest Countries in the World (by Area) Current Events This Week: January 2023 State Abbreviations Dinosaur Fossils (By U.S. State!) The Chinese Zodiac ✖ Related Content Daily Word Quiz: locution Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language