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.
- pro. them (singular). Gender-neutral third-person singular object pronoun, coordinate with gendered pronouns him and her.
from The Century Dictionary and Cyclopedia
- A word coined, in 1858, by C. C. Converse, as a pronoun of the third person and of common gender designed to be substituted for the locutions ‘him or her,’ ‘his or hers,’ etc. It has been but little used.
Proposed in 1858 by Charles Crozat Converse from that + one. (Wiktionary)