1 general:: Phrase(s): rejoice in someone or something to take great joy at someone or something. • I am in love and I rejoice in my beloved! • Roger rejoices in a good night’s sleep.
McGrawhill's American Idioms And Phrasal Verbs
2 general:: Have or possess something highly desirable, as in He rejoices in a keen mind. [Late 1400s]
American Heritage Idioms