Breadcrumb Home > Dictionary > Index B B.A.S.: Meaning and Definition of Find definitions for: B.A.S. Pronunciation: [key] Bachelor of Agricultural Science. Bachelor of Applied Science. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bas (Thesaurus) Barzun basad ✖ Related Content Daily Word Quiz: evanescent Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language