Merriam-Webster's Advanced Learner's Dictionary:
rejoice
re·joice /rɪˈʤoɪs/ verb -joic·es; -joiced; -joic·ing [no obj] : to feel or show that you are very happy about something
• We all rejoiced over/about/in/at our friend's good luck.
• The fans rejoiced when their team finally won the World Series. = The fans rejoiced in their team's World Series victory.
rejoice in the name/title of Brit humorous : to have a name/title that makes people laugh or smile
• a woman who rejoices in the name of Eugenia Whelpbottom
- rejoicing noun [noncount]
• There was much rejoicing when the soldiers returned home.