enby

The story

The noun is a pronunciation spelling of NB, an initialism of non-binary. The word was coined by the Tumblr user “revolutionator” in 2013 as “an nb equivalent to words like boys and girls”: see the quotation. The adjective is derived from the noun.

First known use, by meaning

• from 2013 Pronunciation spelling of NB (“a non-binary person; a person whose gender identity is not strictly that of a man or a woman; one who is outside of the gender binary”).