from Wiktionary, Creative Commons Attribution/Share-Alike License
- pro. they (singular). Gender-neutral third-person singular subject pronoun, coordinate with gendered pronouns he and she.
This pronoun has been independently invented by several people. Don Rickter invented the pronoun xe in November 1971. It appeared in "UU World" (the Unitarian Universalist publication) on 1 May 1973. Mario Pei gave him credit on page 145 of his 1978 book, "Weasel Words". It is also attributed to Jim Sinclair, who apparently coined it circa 1992. (Wiktionary)