18 Pa. C.S. § 2301
Subject to additional definitions contained in subsequent provisions of this article which are applicable to specific chapters or other provisions of this article, the following words and phrases, when used in this article shall have, unless the context clearly indicates otherwise, the meanings given to them in this section:
"Bodily injury." Impairment of physical condition or substantial pain.
"Deadly weapon." Any firearm, whether loaded or unloaded, or any device designed as a weapon and capable of producing death or serious bodily injury, or any other device or instrumentality which, in the manner in which it is used or intended to be used, is calculated or likely to produce death or serious bodily injury.
"Serious bodily injury." Bodily injury which creates a substantial risk of death or which causes serious, permanent disfigurement, or protracted loss or impairment of the function of any bodily member or organ.
"Serious provocation." Conduct sufficient to excite an intense passion in a reasonable person.
18 Pa.C.S. § 2301