Small business vendors at a public market Business is the practice of making one's living or making money by producing or buying and selling products (such as goods and services). [1][2][3][4] It is also "any … Idiom be the biz (Definition of biz from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press) The meaning of BIZ is business. How to use biz in a sentence. Biz is sometimes used to refer to the entertainment business, especially pop music or films. Britannica Dictionary definition of BIZ [singular] informal : business the music biz She left the farm for a career in show biz. [= show business] · The term “biz” is an informal abbreviation of the word “business.” It is commonly used in casual conversation to refer to various aspects of business, industry, or a specific occupation. From Longman Dictionary of Contemporary English Related topics: Theatre, Business biz /bɪz/ noun [singular] informal a particular type of business, especially one relating to entertainment the music biz …