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Meaning of guardian ad litem

guard•i•an ad li•tem

Pronunciation: (gär'dē-un ad lī'tum), [key]
— Law. Law.
  1. a person appointed by a court as guardian of an infant or other person to act on his or her behalf in a particular action or proceeding. Cf. next friend.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.