連盟・聯盟|れんめいrenmei[0]heiban (flat)

1. nounleague; federation; union
   某ぼう連盟れんめい元会長もとかいちょうが背任はいにんの容疑ようぎで逮捕たいほされました。↗

   The former president of a certain association has been arrested on suspicion of breach of trust.

• Synonym連合れんごうNeutralNeutral. Covers union or combination broadly, as in 「国際連合」, and works as a verb too; 「連盟」 stresses an organization pledged to a shared purpose.
• Synonym同盟どうめいWrittenWritten/formal prose. An alliance between states, groups or individuals, as in 「日米同盟」, stressing the pledged relationship; 「連盟」 mostly appears in organization names.
• SynonymリーグNeutralNeutral loanword chiefly for a sports league, as in 「Jリーグ」, but also for a league of states, as in 「アラブ・リーグ」; it can name a competition format, which 「連盟」 never does.
• SynonymユニオンNeutralNeutral loanword meaning union, often a labor union, and much used in group names; for a league or federation in general, 「連盟」 is the usual choice.
• Synonym協会きょうかいNeutralNeutral. An association set up and run by its members, as in 「日本相撲協会」; 「連盟」 stresses several parties allying for a common purpose.
• SynonymアライアンスNeutralNeutral loanword for strategic alliances or cooperation between companies, with a business flavor; 「連盟」 points to a formally constituted organization.
• Related提携ていけいWrittenWritten/formal prose. Cooperation between organizations, as in 「業務提携」, stressing partnership and joint business; no new organization need result.
• Related連立れんりつWrittenWritten/formal prose. Distinct parties standing together, used mostly for coalition governments, as in 「連立政権」; also seen in 「連立方程式」.
• Related結盟けつめいWrittenWritten/formal prose. The act of concluding an alliance, stressing the forming rather than the result, and rather rare; 「連盟」 is the organization once formed.

Use 「連盟」 for a federation of groups united for a common purpose, as in 「日本将棋連盟」. Pick 「同盟」 for pledged alliances like 「日米同盟」, 「連合」 for unions such as 「国際連合」, 「提携」 for business tie-ups, and 「連立」 for coalition governments. The loanwords リーグ, ユニオン and アライアンス cover sports leagues, unions and business alliances respectively.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 共通きょうつうの目的もくてきのために提携ていけいし協同きょうどうすることを誓ちかうこと。また、その組織そしき。