国こく際さい天てん文もん学がく連れん合ごうMeaningsNoun1. International Astronomical Union: IAUKanji used国country際edge天heaven文written sentence学study連take along合come togetherComposed of国こく際さいinternationalNo-adjective天てん文もん学がくastronomyNoun連れん合ごうunion; combination; alliance; confederation; coalition; association; RENGO (Japanese Trade Union Confederation)Noun