What is the term used for a party involved in a lawsuit for the purpose of the suit?

The term "ad litem" refers to a party who is involved in a lawsuit for the specific purpose of the suit, typically representing the interests of others who may not be able to represent themselves, such as minors or individuals deemed incapacitated. In legal terms, "ad litem" is often used to denote someone appointed to act on behalf of another party within the context of a legal proceeding, ensuring that all parties have representation and that their rights are protected during the litigation process.

In contrast, other terms like "defendant" refer specifically to the party being accused or sued in a legal case, while "claimant" indicates someone making a claim, usually a plaintiff. The "liable party" implies responsibility for damages or obligations, which does not encompass the broader role that "ad litem" signifies in ensuring representation during the suit. Understanding these distinctions clarifies why "ad litem" is the correct choice for this specific context regarding involvement in a lawsuit.