EU加盟国いーゆーかめいこくイーユーかめいこくMeanings1nounEU member state; EU countryRefers to a country that is a member of the European Union. Used in political, economic, and news contexts.EU加盟国いーゆーかめいこくは共きょう通つうの通つう商しょう政せい策さくをとっている。