noun
a person appointed by a court to act as a legal representative for a minor or incapacitated person in a lawsuit
adjective
relating to or appointed for a specific legal proceeding or purpose
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The court appointed a guardian ad litem to represent the best interests of the child in the custody case.
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The ad litem lawyer is here to help you with your legal issues.
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I heard the ad litem guy is really good at getting things done in court.
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She acted as an ad litem for her friends, always looking out for their well-being.