1.NounA member of a rock band, or a solo artist in the genre, especially one with celebrity status.
"By 1967, Jimi Hendrix had become a rockstar."
2.NounA person who is renowned or revered in his or her field of accomplishment.
"By 1985, Michael Jordan had become a rockstar of the NBA."
3.NounSomeone who works hard, achieves wins, or both; used in expressions of gratitude.
"Congratulations to Ashley, who once again proved that she is a rockstar by rescuing a key account from the threat of nonrenewal."
4.NounAny animal, plant, or other thing that is renowned amongst others of its type.
"Many birds can sing beautifully, and various birds can mimic sounds that they hear, but lyrebirds are rockstars of mimickry in the bird world.; Owls are rockstars among raptors in the respect that they hunt amazingly well while also doing it under pitch-dark conditions and silently."