costar

1 of 2

noun

co·​star ˈkō-ˌstär 

variants or co-star

plural costars or co-stars

: one of two or more main performers who star in a movie, play, etc.

… the star seems more relaxed and confident, and there's a bracing snap to the byplay between him and his costars.

—Mark Harris

costar

2 of 2

verb

variants or co-star

costarred or co-starred; costarring or co-starring

1

transitive : to employ or present (someone) as one of two or more leading performers in a movie, play, etc.

Directed by Lasse Hallström … and costarring a fine ensemble …

—Leonora Langley

2

intransitive : to appear with another star in a movie, play, etc.

Examples of costar in a Sentence

Recent Examples on the Web

Noun

Lovato's Camp Rock costar Joe Jonas also made a guest appearance and performed on stage with her. —Madison E. Goldberg, PEOPLE, 14 Apr. 2026

Her speech was interrupted by Carpenter's former Girl Meets World costar Corey Fogelmanis, who portrayed a waiter asking her to pay her bill in the live segment. —Wesley Stenzel, Entertainment Weekly, 12 Apr. 2026

Verb

Nina Dobrev and then-boyfriend, The Vampire Diaries costar Ian Somerhalder, were spotted out and about at the Empire Polo Club in 2012. —Stephanie Sengwe, PEOPLE, 10 Apr. 2026

Then, Cat Witch, whose identity has been known to viewers as Descendants costar Kylie Cantrall, finally revealed herself to the panel as well. —Jillian Sederholm, Entertainment Weekly, 2 Apr. 2026

Word History

First Known Use

Noun

1888, in the meaning defined above

Verb

1896, in the meaning defined at sense 2