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 deprivation has been defined in several ways.
To state something is true in answering a complaint filed in a lawsuit.
The general meaning of the word caution is the care taken to avoid any danger or mistakes. The word caution is used in a very regular manner and is an everyday word. If one wants to warn someone else, they always say that stay cautious.