Latin.Let him or her beware. 1 An admonition, caution, or warning. 2A formal notice or warning given by a party to a judge or other court officer concerning his or her behavior and requesting a suspension of the proceeding until the merits of the notice or warning are determined. 3 A formal notice to a court or public official that the notifier has an interest in a matter or property and requests the suspension of some procedure or proceeding concerning the matter or property until the notifi...