soulmate

Từ điển Oxford Advanced Learner 8th

soul·mate [soulmate soulmates] BrE [ˈsəʊlmeɪt] NAmE [ˈsoʊlmeɪt] noun
a person that you have a special friendship with because you understand each other's feelings and interests

Example Bank:
•He's not just my friend, he's my soulmate.
•Natalie and I are soulmates. She's the one I want to spend the rest of my life with.
•The movie is a romantic comedy about a woman's search for a soulmate.