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 Tracee Ellis Ross and Dakota Johnson costar as soul music legend Grace Davis and her assistant, Maggie, respectively, and there's an extra layer of significance to their casting. cleveland, "‘The High Note’ hits all the right beats," 27 May 2020 The Scrubs costars and real-life BFFs have launched a new rewatch podcast of their beloved series, taking fans through the show’s nine seasons, episode by episode. Dave Quinn,, "Zach Braff and Donald Faison Are Rewatching Scrubs for a New Podcast," 1 Apr. 2020 After Melissa shared the video, her fellow costars and other celebrities spoke out with messages of support. Lauren Rearick, Teen Vogue, ""Supergirl" Star Melissa Benoist Shared She Was Once in an Domestically Violent Relationship," 29 Nov. 2019 One of those friends happened to be Jacob Elordi, Zendaya's Euphoria costar and ex-boyfriend of Joey King. Carolyn Twersky, Seventeen, ""Euphoria" Costars Zendaya and Jacob Elordi Were Spotted On Vacation Together in Greece," 3 Sep. 2019 Jeana Keough's former Real Housewives of Orange County costars are expressing their condolences following the death of her estranged husband Matt Keough. Eric Todisco,, "RHOC Alums Vicki Gunvalson and Tamra Judge React to Death of Former Costar Jeana Keough's Ex Matt," 3 May 2020 Demi Moore, Rob Lowe and Jennifer Grey, friends and costars of Swayze's appear in the documentary to talk about working with him and loving him. Marianne Garvey, CNN, "Patrick Swayze's widow Lisa Niemi opens up about life with the actor," 15 Aug. 2019 What followed was a number of clips that featured Richards seemingly in conflict with many of her costars. Eric Todisco,, "Denise Richards Says She Apologized to Waiter After Cringey RHOBH Scene: 'I Felt Terrible'," 16 Apr. 2020 Courtney Cox and the rest of their costars shared the same post at the same moment. Jenny Hollander, Marie Claire, "A 'Friends' Reunion Special Is Coming to HBO Max," 21 Feb. 2020 Recent Examples on the Web: Verb Rose Byrne costars as the animals’ human friend, Bea, a character modeled on Potter. Los Angeles Times, "What’s on TV Friday, April 17: MacGyver on CBS; Coronavirus," 16 Apr. 2020 Upon being shown a picture of herself at her Game of Thrones costars Kit Harington and Rose Leslie's wedding in June 2018, Turner actually groaned. Kayleigh Roberts, Marie Claire, "Sophie Turner Says the Outfit She Wore to Kit Harington's Wedding Is One of Her Worst Looks Ever," 7 Mar. 2020 Producer Eric Andre costars in the project, which will hit theaters nationwide. Ariana Marsh, Harper's BAZAAR, "The Best Documentaries of 2020 That Have Been Announced So Far," 6 Feb. 2020 Billy Porter also costars as Barrett, the man who produces their cosmetics, but the part leans too heavily on gay stereotypes pulled from another decade. Maureen Lee Lenker,, "Like a Boss is a female buddy comedy in need of a serious makeover: Review," 9 Jan. 2020 Henry Golding costars as Emily's author husband, impossibly dashing and possibly duplicitous. Isaac Feldberg, Fortune, "What to watch on Amazon Prime while social distancing during the coronavirus pandemic," 27 Mar. 2020 Aniston is currently promoting her new Apple TV+ series, The Morning Show, which costars Reese Witherspoon. Amy Mackelden, Harper's BAZAAR, "Jennifer Aniston Just Wore a Strapless Black Dress in the Rain," 30 Oct. 2019 Twenty-seven people wrote letters of support to the judge in her defense, including her husband William H. Macy (who was not indicted in the investigation) and her former Desperate Housewives costar Eva Longoria. Christian Holub,, "Felicity Huffman sentenced to 14 days in jail in college admissions scandal," 13 Sep. 2019 Kevin Bacon costars as a longtime FBI agent, Jackie Rohr, who has plenty of experience with corruption himself., "Aldis Hodge on Showtime’s ‘City on a Hill,’ and ‘Leverage’ fan loyalty: ‘I wish we could give you a movie’," 14 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 at sense 2

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Time Traveler for costar

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The first known use of costar was in 1888

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Last Updated

31 May 2020

Cite this Entry

“Costar.” Dictionary, Merriam-Webster, Accessed 31 May. 2020.

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More Definitions for costar


How to pronounce costar (audio)

English Language Learners Definition of costar

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

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Thesaurus: All synonyms and antonyms for costar

Rhyming Dictionary: Words that rhyme with costar

Spanish Central: Translation of costar

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