From Longman Dictionary of Contemporary EnglishAmerican Bar Association, thethe American Bar AssociationAˌmerican ˈBar Associˌation, the a large national organization for lawyers in the USFrom Longman Business DictionaryAmerican Bar AssociationAˌmerican ˈBar Associˌation abbreviation ABA nounLAWORGANIZATIONS a professional organization for lawyers in the US