An actor who shares main roles with another actor in a film or performance, or to appear as a costar.
From co- (together) plus star, emerging in 20th century entertainment terminology, literally meaning 'star together,' created during the golden age of cinema.
The word 'costar' was invented by Hollywood in the early 1900s when studios needed to describe actors who were equals rather than a star plus supporting cast—the word literally shaped how we think about fame hierarchies.
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