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

At first blush, Rue, Zendaya’s character, would seem a role for her Shake It Up costar Bella Thorne, who has cultivated a wild-child persona since leaving the Disney fold. Tyler Mitchell, Vogue, "With HBO’s Euphoria, Zendaya Puts Her Disney Past Behind Her Once and For All," 9 May 2019 The Oscar winner previously dated her X-Men costar Nicholas Hoult and director Darren Aronofsky. Maggie Maloney, Town & Country, "Everything You Need to Know About Jennifer Lawrence's Stunning Engagement Ring," 26 Feb. 2019 Then again, on January 11, the trio met up with their costar Moises Arias (a.k.a. Victoria Rodriguez, Seventeen, "Most Iconic Disney Channel Reunions of All Time," 12 Feb. 2019 According to the Los Angeles Times, Selena will walk the red carpet at Cannes Film Festival in the South of France alongside her costars in the movie The Dead Don’t Die. Kara Nesvig, Teen Vogue, "Selena Gomez to Make Cannes Film Festival Debut," 21 Apr. 2019 Even her Idol costars took the opportunity to teases her a little bit. Glamour, "Katy Perry Had a Complete Meltdown During This American Idol Proposal," 27 Mar. 2019 Zac was suspected to be dating his Baywatch costar Alexandra Daddario back in 2017. Carolyn Twersky, Seventeen, "Everything You Need to Know About Zac Efron's Love Life," 6 Mar. 2019 Although their performance was epic, Cooper was nervous to take the stage with his multi-time Grammy winner costar. Erica Gonzales, Harper's BAZAAR, "Lady Gaga and Bradley Cooper Gave the Most Intimate Performance the Oscars Has Ever Seen," 25 Feb. 2019 Following the controversial news released earlier this month that Claire Foy was paid significantly less than her male costar Matt Smith on The Crown, the actress—who played Queen Elizabeth II on the hit show for two seasons—has finally spoken out. Christian Allaire, Vogue, "Claire Foy Isn’t Surprised by The Crown’s Pay-Gap Controversy," 25 Mar. 2018

Recent Examples on the Web: Verb

After her triumphant stand-up specials (2016’s Baby Cobra and 2018’s Hard Knock Wife), Wong has penned the film with Randall Park, who will also costar. Vogue, "Watch a Trailer for the New Netflix Ali Wong Rom-Com, Always Be My Maybe," 23 Apr. 2019 January 2017 Ashley Tisdale and Vanessa Hudgens High School Musical costars Ashley Tisdale and Vanessa Hudgens finally delivered the duet HSM fans were waiting for, thanks to Ashley's YouTube channel. Victoria Rodriguez, Seventeen, "Most Iconic Disney Channel Reunions of All Time," 12 Feb. 2019 Expected guests include designer Misha Nonoo, her former Suits costar Abigail Spencer, Serena Williams (who reportedly helped organize), and more. Amy Mackelden, Harper's BAZAAR, "Meghan Markle Is Hosting Her Real Baby Shower Today in NYC," 20 Feb. 2019 Just because Brown won’t be there doesn’t mean her Stranger Things costars won’t be. Dave Quinn,, "Millie Bobby Brown Splits Kneecap, Forcing Her to Skip the MTV Movie & TV Awards: 'Another Milestone'," 16 June 2018 Borstein also thanked her team and costars at Mrs. Maisel—the Amazon hit starring Rachel Brosnahan as the titular stand-up comedian—and her family. Erica Gonzales, Harper's BAZAAR, "Alex Borstein Accepted Her Emmy Award Without a Bra and We're All Inspired," 18 Sep. 2018 Along with Capshaw, costars Justin Chambers and Caterina Scorsone are featured in the hilarious gag reel. Karen Mizoguchi,, "Jessica Capshaw Shares Grey’s Anatomy Bloopers Featuring Ellen Pompeo Before Final Episode," 16 May 2018 On April 5, Lynch shared a picture of himself and costar Shipka in character as Harvey and Sabrina on Instagram. Kayleigh Roberts, Marie Claire, "Everything You Need to Know About the New 'Sabrina the Teenage Witch' TV Show," 1 Aug. 2018 Natasha Lyonne costars in Orange Is the New Black, which returns to Netflix this month. Samantha Leach, Glamour, "Read Natasha Lyonne's Love Letter to Her 'Odd Couple' Other Half, Rosie O'Donnell," 26 July 2018

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

18 May 2019

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Time Traveler for costar

The first known use of costar was in 1888

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More Definitions for costar



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).


a sum of money that is sent as a payment

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