Which term means "another self"?

The term "ALTER EGO" translates to "another self" in Latin and is used to refer to a secondary personality or persona that can be distinct from someone's primary self. This concept is often employed in legal contexts, psychological discussions, and in literary analysis to denote a character or aspect of a person that represents an alternative personality or identity.

In contrast, the other terms have different meanings: "AD NAUSEAM" refers to something that continues to the point of annoyance, "AD LITEM" relates to a representative appointed for legal proceedings on behalf of a person, and "AD HOC" pertains to something that is created for a specific purpose or situation. These distinctions highlight the unique usage of "ALTER EGO" in conveying the idea of a secondary self or alternate identity.