It means “friend of the court”. The person is not a party to the case in any manner. His sole purpose is to assist the court by providing substantial information or insight for the smooth disposal of the case.
The term refers to a lack of diligence and activity in making a legal claim, or moving forward with legal enforcement of a right, particularly regarding equity.
To convict an accused person guilty of a crime at the conclusion of a criminal prosecution, or after the entry of a plea of guilty or a plea of nolo contendere.
To state something is true in answering a complaint filed in a lawsuit.