noun
host country; sponsoring nation
Refers to the country that organizes and hosts an international event, conference, or competition.
次のオリンピックの主催国はどこですか。
Which country is the host for the next Olympics?
主催国として、万全の準備を整えなければならない。
As the host country, we must make thorough preparations.
Compound of 主催 (shusai, 'sponsorship, hosting') and 国 (koku, 'country').