Answer: The Oxford English Dictionary traces singular they back to 1375, where it appears in the medieval romance William and the Werewolf. Except for the old-style language of that poem, its use of singular they to refer to an unnamed person seems very modern.
Explanation: The singular they emerged by the 14th century, about a century after the plural they. It has been commonly employed in everyday English ever since then and has gained currency in official contexts.
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