Plural form: people or things that exist or happen during the same time period as something or someone else.
From contemporary or cotemporary, with the plural '-ies' suffix. The word allows discussion of multiple figures or events from the same historical era.
When historians talk about 'Mozart's cotemporaries,' they're naming all the other brilliant composers working at exactly the same moment—Haydn, Beethoven, and others who were literally in the same musical moment in time.
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