In most states, this means an act which if done by an adult would be a crime. Some states, however, also include status offenses as delinquent acts.
An act committed by a juvenile which, if committed by an adult, would be a criminal act. The juvenile court has jurisdiction over delinquent acts. Delinquent acts include crimes against persons, crimes against property, drug offenses, and crimes against public order when such acts are committed by juveniles.