noun
Federal Republic of Nigeria
Official country name; used in formal contexts, news, and geography.
ナイジェリア連邦共和国はアフリカで最も人口の多い国です。
The Federal Republic of Nigeria is the most populous country in Africa.
Short form commonly used in everyday conversation; ナイジェリア連邦共和国 is the full official name.
From English 'Nigeria' + 連邦共和国 (federal republic).