A deliberate act that causes harm to another, and for which the injured person may sue the wrongdoer for damages.
The term "tort" simply means a wrongful act that causes injury. While most "tort" (or personal injury) cases are based on one person's careless or negligent conduct (such as cases arising from a car accident), intentional torts stem from purposeful action.
Acts of domestic violence, such as assault, are intentional torts (as well as crimes). Other common intentional torts include battery, false imprisonment, and intentional infliction of emotional distress.