Ad litem

(Latin) legal term meaning "in this case only" (e.g. "Ian Thomas appointed by the court, may administer ad litem the settlement of the estate of the late Paul Hammer")

Ad litem is a term used in law to refer to a party appointed by a court to act in a lawsuit on behalf of another party—for instance, a child or an incapacitated adult—who is deemed incapable of representing themselves. An individual who acts in this capacity is called a guardian ad litem. This term is no longer used in the United Kingdom since the passage of the Children Act 1989, which established the role of children's guardian instead.
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Latin: for the suit - (read more on Ad litem)
  

For a lawsuit or action