Definition of nonbinary
: not binary: such asa : not restricted to two things or parts nonbinary votingb : of, relating to, or being a system of numbers that does not use 2 as its base nonbinary mathc : relating to or being a person who identifies with or expresses a gender identity that is neither entirely male nor entirely female … an effort to create more equality for nonbinary and transgender students across campus. — Phoebe Roe … many people with nonbinary genders use “they” and “their” pronouns … — Lucy Brisbane
From the M-W Editors
1863
First Known Use of nonbinary
1863
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