epicene gender
Definition - A term from Latin and Greek grammar that is used to label nouns that can denote either sex without changing their grammatical gender.

Etymology -
The term derives from the Latin epicoenus, common (ultimately from from the Greek epi-, on + koinos, common.)

Oxford English Dictionary -
Its first citation is from circa 1528:
"Wherefor all gendyrs dysconte[nt] be … The dubyum & the epysyn Also."
(Impeachm. Wolsey in Furniv. Ballads fr. MSS. I. 356)

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