Xenogender (coined in 2014 by Tumblr user Baaphomett in a submission to the MOGAI-Archive blog, from xeno alien + "gender") is a nonbinary gender identity "that cannot be contained by human understandings of gender; more concerned with crafting other methods of gender categorization and hierarchy such as those relating to animals, plants, or other creatures/things." Xenogender isn't defined in relation to "female" or "male" (the binary genders), but by other kinds of ideas that most people don't think of as having to do with gender. When people talk about nonbinary gender, they often find that there aren't any words for their experiences. This is called a lexical gap. In order to fill a lexical gap, this wiki takes up "xenogender" as an umbrella term for an entire category of nonbinary genders that are defined by characteristics with no relation whatsoever to "female" or "male." The adjective "xenine" means "of or pertaining to xenogenders". The noun form of xenine is xenity.

• Because a gender binary society doesn't give much in the way of roles or descriptions for nonbinary genders, some transgender and nonbinary people address the challenge of describing their unusual gender identities by creative methods, referring to concepts that aren't usually seen as related to gender. This has been observed in very young nonbinary people.