in the DSM-IV-TR, a behavioral disorder of the younger years marked by repetitive disobedient, aversive or violent actions in the direction of authoritative figures which is more significant than typically observed in kids of like ages and persists for at six months or more. It develops as temper tantrums, active disobeying of rules, wandering, being inclined to argue to start arguments, resistance to agree, or being irritated easily.
OPPOSITIONAL DEFIANT DISORDER: “Michael started exhibiting symptoms of oppositional defiant disorder at the age of three.”