A more thorough explanation:

Definition: Proamita magna is a Latin term used in civil law to refer to a great-great-great-aunt.

Example: If your grandfather's sister had a daughter who had a daughter who had a daughter, that last daughter would be your proamita magna.

This term is used to describe a specific degree of kinship in civil law. It is important to understand the different degrees of kinship when dealing with inheritance, property rights, and other legal matters that involve family relationships.