co·​star | \ ˈkō-ˌstär How to pronounce costar (audio) \
variants: or co-star
plural costars or co-stars

Definition of costar

 (Entry 1 of 2)

: one of two or more main performers who star in a motion picture, 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


variants: or co-star
costarred or co-starred; costarring or co-starring

Definition of costar (Entry 2 of 2)

1 transitive : to employ or present (someone) as one of two or more leading performers in a motion picture, play, etc. Directed by Lasse Hallström … and costarring a fine ensemble …— Leonora Langley
2 intransitive : to appear with another star in a motion picture, play, etc.

Examples of costar in a Sentence

Recent Examples on the Web: Noun

Celebrity News Issa Rae’s costars were just as shocked—and excited—about her (rumored) engagement as the rest of us were. Zoe Weiner, Glamour, "Issa Rae’s Insecure Costars Basically Just Confirmed Her Engagement," 1 Apr. 2019 Following The Young and the Restless star’s shocking death at 52, many of his-costars and friends have paid tribute to the actor. Megan Stein, Country Living, "'The Talk' Host Sheryl Underwood Pays Tearful Tribute to Kristoff St. John," 5 Feb. 2019 And Burnett's costar will be none other than Amy Poehler, known for being hilarious herself on TV shows like Parks and Recreation and Saturday Night Live. Megan Friedman, Good Housekeeping, "Carol Burnett Is Finally Coming Back to Television," 21 Oct. 2016 To write this with Alan was a joy, and to have Tiffany as my costar is fantastic. Joey Nolfi,, "Billy Crystal to direct, star with Tiffany Haddish in new comedy Here Today," 4 Sep. 2019 Not pictured: The actor who plays Jon Snow, Kit Harington, Rose's husband and their costar. Katherine J Igoe, Marie Claire, "'Game of Thrones' Stars Emilia Clarke and Rose Leslie Took a Fabulous Vacation Together," 30 Aug. 2019 The 78-year-old Domingo has received the full support from Salzburg Festival management and his costars ahead of Sunday’s performance of Verdi’s ‘‘Luisa Miller,’’ in which the famous tenor will sing the baritone title role., "Iranian oil tanker pursued by US says it is going to Turkey," 25 Aug. 2019 Monte was rescued from a kill-shelter in New Mexico, according to People magazine, which revealed photos of Monte and his costars earlier this month. Caitlin O'kane, CBS News, "Rescue dog to become Disney star in new "Lady and the Tramp" live-action remake," 21 Aug. 2019 Cameron Boyce’s tragic and unexpected death has left an impact on his Descendants costars that will undoubtedly last a lifetime. De Elizabeth, Teen Vogue, "Dove Cameron on How the Loss of Cameron Boyce Impacted Her "Descendants" Costars," 11 Aug. 2019

Recent Examples on the Web: Verb

Check out the video above to hear more from Leitch, Elba, Johnson and Hobbs & Shaw‘s costar Jason Statham on the changing tides of diversity in Hollywood. Danielle Young, Essence, "Here Is The One Thing 'Hobbs & Shaw' Can Teach Hollywood," 3 Aug. 2019 Boyce’s costars Kathy Najimy, Dove Cameron, Booboo Stewart, Mitchell Hope, Monique Coleman, and Zachary Gibson were all in attendance. Rosy Cordero,, "Cameron Boyce remembered for his 'extraordinary talent and loving heart' by Kenny Ortega at his Walk of Fame ceremony," 25 July 2019 Coincidentally — or not — Rock is currently starring in another horror project, the new Saw movie, which costars Samuel L. Jackson. Clark Collis,, "Dave Chappelle and Chris Rock almost costarred in Creepshow episode," 21 July 2019 The film costars Greg Bryk, Stephen McHattie, and Ted Atherton. Clark Collis,, "Rabid remake gets disturbing first trailer," 4 July 2019 Williams’ Girls costars Lena Dunham, Jemima Kirke, and Zosia Mamet were among the guests in attendance, as well as Katy Perry, Seth Meyers and John Mayer. Alexis Reliford,, "After Nearly 4 Years Together, Allison Williams & Husband Split," 30 June 2019 The international production is in English, German and French and costars Lizzy Caplan and Vincent Kartheiser. Sean Axmaker | Stream,, "Home viewing this week: ‘Us,’ ‘City on a Hill,’ ‘Das Boot’ (2018), ‘Hotel Mumbai,’ ‘Beats’," 21 June 2019 Lead by Thor: Ragnarok costars Chris Hemsworth and Tessa Thompson, the film made just $28.5 million domestically this past weekend. Angela Watercutter, WIRED, "Men in Black: International," 17 June 2019 The actress’ Girls Trip costar Tiffany Haddish will present the award. Tyler Aquilina,, "Jada Pinkett Smith will receive 2019's Trailblazer Award at the MTV Movie & TV Awards," 11 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'costar.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of costar


1888, in the meaning defined above


1896, in the meaning defined above

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Statistics for costar

Last Updated

21 Sep 2019

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Time Traveler for costar

The first known use of costar was in 1888

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English Language Learners Definition of costar

: one of two or more main actors in a movie, television show, or play

More from Merriam-Webster on costar

Rhyming Dictionary: Words that rhyme with costar

Spanish Central: Translation of costar

Comments on costar

What made you want to look up costar? Please tell us where you read or heard it (including the quote, if possible).


formidable, illustrious, or eminent

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