BCAA Views 7 meanings found BCAA most commonly denotes the essential nutrients known as branched‑chain amino acids, but the same letters also identify regional bodies such as a clean‑air authority, an automobile association, and a sports league. Medical Branched Chain Amino Acids Community British Columbia Automobile Association Annual Battery Conference on Applications and Advances Governmental Benton Clean Air Authority Academic & Science Branched Chain Amino Acid Business Bali Christian Art Association Sports Bethlehem Central Athletic Association