Cogender
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There are several terms that share the name "cogender." You may be looking for:
Cogender (Gender Inclusion)
Inclusion of people of different genders in a community, as opposed to a men-only or women-only community, generally used in print to reference gender includion in schools.
Cogender (Anthropology)
An uncommonly-used term that is not clearly defined. They may be using it as a synonym for third gender, or they may be using it in the above sense, or both.
Cogender (Gender Identity)
A type of multigender identity.