Having a connection to your Assigned Gender At Birth simply by virtue of it being your AGAB. Your AGAB may or may not be part of your gender (e.g., a postmascuium person does not have any masculinity in their gender, but are still connected to masculinity by virtue of being AMAB. A postfeminium person who is fingender does have femininity in their gender, but can still identify as postfeminium regardless).

From Latin feminam, masculum, alium (other) & tertium (third).

Postfeminium (AFAB)

Postmascuium (AMAB)

Postertium (AXAB) (third gender)

Postalium (AXAB / AIAB) (intersex / other)