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Lexicographer, snoot, and English-usage maven Bryan A. Garner used the word ‘epicene’ in a tweet:
"Neither got what they wanted." Page 1 of today's @nytimes, in reference to Trump & Putin. Why use the epicene "they" when the sex is known?
—July 8, 2017
From Wiktionary—epicene:
Adjective
- Of or related to a class of Greek and Latin nouns that may refer to men or women but have a fixed grammatical gender.
- Of or related to nouns (in any language) that have a single form for male and female referents.
- Of indeterminate sex, whether asexual, hermaphrodite, androgynous, or intersex.
- Effeminate.
- Indeterminate; mixed.
- Suitable for use regardless of sex: unisex.
Noun
- An epicene word.
- The epicene words of a language as a class.
- An epicene person, an androgyne, whether biologically asexual, intersex, or hermaphrodite or of indeterminate sex in behavior and appearance.
- An effeminate man, particularly a man dressed as a woman.
Etymonline.com on epicene.
Wikipedia on epicene.