Gender can be divided into at least five dimensions: body, identity, expression, sexuality and role. For each dimension we can name normative and expansive forms (e.g. cisgender vs. transgender). If we can’t tell these dimensions apart, we won’t be able to understand non-binary gender. The individual dimensions are independent of each other. Non-binary gender has to do only with the identity of a person. The appearance, the nature of the body or the sexuality of a non-binary person does not change their non-binarity.
Based on these levels of gender, it is then possible to discuss what constitutes non-binary gender. On the one hand, non-binary gender can be a gender identity of a person or simply a gender definition. It is also important to understand that very different people can see themselves as non-binary and can also live very different lives. Non-binary gender (or non-binary) is just a generic term that simply means that someone cannot or does not want to fit into the conventional, strictly two-part gender system. A synonymous term is genderqueer.