What does 同盟 mean?
同盟 is a Japanese noun meaning “alliance, union, league” in English. It is written as 同盟 in kanji, どうめい in hiragana, and doumei in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
戦争の直前、日本がフランスと同盟を結びました。
Japan entered into an alliance with France just before the war.