all-star noun 2adjective 1forms 1 noun2 •A member of a team of star players. •An outstanding achiever; someone considered to be among the best in their field.She is an all-star on an otherwise mediocre team. adjective1 •Of which all members or participants are top performers or celebrities.The pantomime features an all-star cast.This dream team features an all-star roster. formsall-stars