Nolo's Plain-English Law Dictionary

Ad Litem

(ad-light-em) Latin, meaning "for the purposes of the legal action only." A person who files a lawsuit for a minor child or for a person who is incompetent acts as "guardian at litem" (guardian just for the purposes of the lawsuit). A person acting ad litem has the responsibility to pursue the lawsuit and to account for the money recovered for damages. (See also: guardian ad litem)