A more thorough explanation:

PROMATERTERA

Promatertera is a Latin term used in Roman and civil law to refer to a person's great-great-aunt. Specifically, it refers to the sister of one's great-grandmother.

For example, if your great-grandmother had a sister, that sister would be your promatertera. Similarly, if your father's grandmother had a sister, that sister would also be your promatertera.

Another example would be if you were researching your family tree and discovered the name of your great-grandmother's sister. You could then refer to her as your promatertera.

The term promatertera is used to describe a specific familial relationship - the sister of one's great-grandmother. The examples provided illustrate how this term can be used in different contexts, such as in personal family history or in legal documents related to inheritance or property rights.