International Civil Aviation Organization
From Longman Business DictionaryInternational Civil Aviation OrganizationˌInternational ˌCivil Aviˈation Organiˌzation abbreviation ICAO nounTRAVELORGANIZATIONS an organization whose purpose is to establish safety standards in air travel and provide information and advice to AIRLINEs (=companies that carry people and goods by plane)