Oxford Dictionary English megastar noun noun BrE BrE//ˈmeɡəstɑː(r)// ; NAmE NAmE//ˈmeɡəstɑːr// (informal) Celebrity news, Film people Add to my wordlistjump to other resultsa very famous singer, actor or entertainer See related entries: Celebrity news, Film peopleSee megastar in the Oxford Advanced American DictionaryCheck pronunciation: megastar oxfordlearnersdictionaries.com