Sui generis
In sociology, the "sui generis" is what has been externalized, then internalized in the overall public and becomes a part of society that simply exists in its construct. It is not something that is not thought to have been created, because it is imbedded in everyone's way of thinking and being. Instances include the idea of love, or going to school, or clothing belonging to a specific gender. These examples are "sui generis" for they simply exist in society and are widely accepted without thoughts of where they come from or how they were created.
Cisgender
"Cisgender" has its origin in the Latin-derived prefix "cis-", meaning "on this side of", which means the opposite of "trans-", meaning "across from" or "on the other side of". This usage can be seen in the cis–trans distinction in chemistry, the cis–trans or complementation test in genetics, in Ciscaucasia (from the Russian perspective), in the ancient Roman term Cisalpine Gaul (i.e., "Gaul on this side of the Alps"), Ciskei and Transkei (separated by the Kei River), and more recently, Cisjordan, as distinguished from Transjordan. In the case of gender, "cis-" describes the alignment of gender identity with assigned sex.