Nigeria UK /naɪˈd͡ʒɪə̯ɹiə/US /naɪˈd͡ʒɪɹiə/ noun1 •A country in West Africa, south of the country of Niger. Official name: Federal Republic of Nigeria. Capital: Abuja. Largest city: Lagos. Currency: naira (₦).Doctors in Nigeria have criticized a mass national identification registration policy, involving tens of millions of citizens, as Covid-19 cases and deaths rise in the country. — 2021