mutual / mjúːʧuəl

相互の、共同の、共通の

Treaty of Mutual Cooperation and Security Between Japan and the United States of America.
日本国とアメリカ合衆国との間の相互協力及び安全保障条約

※日米安全保障条約の正式名

mutual affection [infatuation] 相思相愛
mutual aid [assistance, help] 相互扶助
mutual interest [advantage] 相互利益
mutual understanding 相互理解
by mutual consent [agreement] 互いに同意の上で[の]

語源　ラテン語　変化する　mutare