An assault is the act of illegally committing physical harm or unwanted physical contact upon a person or, in some specific legal definitions, a threat or attempt to commit such an action. It is both a crime and a tort and, therefore, may result in criminal prosecution, civil liability, or both. Generally, the common law definition is the same in criminal and tort law. Traditionally, common law legal systems have separate definitions for assault and battery. When this distinction is observed, battery refers to the actual bodily contact, whereas assault refers to a credible threat or attempt to cause battery. Some jurisdictions combined the two offences into a single crime called "assault and battery", which then became widely referred to as "assault". The result is that in many of these jurisdictions, assault has taken on a definition that is more in line with the traditional definition of battery. The legal systems of civil law and Scots law have never distinguished assault from battery. Legal systems generally acknowledge that assaults can vary greatly in severity. In the United States, an assault can be charged as either a misdemeanor or a felony. In England and Wales and Australia, it can be charged as either common assault, assault occasioning actual bodily harm (ABH) or grievous bodily harm (GBH). Canada also has a three-tier system: assault, assault causing bodily harm and aggravated assault. Separate charges typically exist for sexual assaults, affray and assaulting a police officer. Assault may overlap with an attempted crime; for example an assault may be charged as an attempted murder if it was done with intent to kill. Related definitions Battery In jurisdictions that make a distinction between the two, assault usually accompanies battery if the assailant both threatens to make unwanted contact and then carries through with this threat. See common assault. The elements of battery are that it is a volitional act, done for the purpose of causing a harmful or offensive contact with another person or under circumstances that make such contact substantially certain to occur, and which causes such contact. Aggravated assault Aggravated assault is, in some jurisdictions, a stronger form of assault, usually using a deadly weapon. A person has committed an aggravated assault when that person attempts to: cause serious bodily injury to another person with a deadly weapon have sexual relations with a person who is under the age of consent cause bodily