noun
Formal Japanese name for the United Kingdom of Great Britain and Northern Ireland. Used in official contexts, news, and formal writing. In casual conversation, イギリス is far more common.
連邦王国は欧州連合から離脱した。
The United Kingdom withdrew from the European Union.
連邦王国の正式名称は「グレートブリテン及び北アイルランド連合王国」です。
The official name of the United Kingdom is 'the United Kingdom of Great Britain and Northern Ireland'.
イギリス is the everyday term for the UK, used in most casual and informal contexts. 連邦王国 is a formal, official designation rarely used in daily speech.
英国 is a common abbreviation for the United Kingdom, used in compounds like 英国政府 (British government) and in slightly formal contexts. It is more common than 連邦王国 but still less casual than イギリス.
Compound of 連邦 (federation/commonwealth) and 王国 (kingdom), directly translating the concept of a united kingdom composed of multiple countries.