Definition of nonbinary
: not binary: such as
a : not restricted to two things or parts
nonbinary voting
b : of, relating to, or being a system of numbers that does not use 2 as its base
nonbinary math
c : 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
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Merriam-Webster unabridgedWords at Play
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Time Traveler for nonbinary
The first known use of nonbinary was in 1863
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