In 1789, William H. Marshall records the existence of a dialectal English epicene pronoun, singular ou : "'Ou will' expresses either he will, she will, or it will." Marshall traces ou to Middle English epicene a, used by the fourteenth-century English writer John of Trevisa, and both the OED and Wright's English Dialect Dictionary confirm the use of a for he, she, it, they, and even I.
The dialectal epicene pronoun a is a reduced form of the Old and Middle English masculine and feminine pronouns he and heo. By the twelfth and thirteenth centuries, the masculine and feminine pronouns had developed to a point where, according to the OED, they were "almost or wholly indistinguishable in pronunciation." The modern feminine pronoun she, which first appears in the mid twelfth century, seems to have been drafted at least partly to reduce the increasing ambiguity of the pronoun system....
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