From Longman Dictionary of Contemporary EnglishAdvertising Standards AuthorityˌAdvertising ˈStandards Auˌthority → the Advertising Standards AuthorityFrom Longman Business DictionaryAdvertising Standards AuthorityˌAdvertising ˈStandards Auˌthority abbreviation ASA nounMARKETINGORGANIZATIONS a British organization that makes sure that advertising is honest, truthful, and acceptableAdvertisements with flight prices must include all taxes and other charges, the Advertising Standards Authority has ruled.