What is Aggravated Assault?

Legal Definition
A criminal assault — a threat or physical act that creates a reasonable apprehension of imminent harmful or offensive contact with one's person — involving an additional, aggravating factor, such as the intent to inflict serious bodily injury or the use of a dangerous weapon.
Illustrative case law
See, e.g. Com. v. Patrick, 933 A.2d 1043 (Pa. Super. Ct. 2007).
See also
Legal Definition
An assault with circumstances of aggravation or of a heinous character or with intent to commit another crime. In re Burns (C. C-) 113 Fed. 992; Norton v. State, 14 Tex. 393. See Assault. Defined in Pennsylvania as follows: "If any person shall unlawfully and maliciously inflict upon another person, either with or without any weapon or instrument, any grievous bodily harm, or unlawfully cut, stab, or wound any other person, he shall be guilty of a misdemeanor," etc. Brightly, Purd. Dig. p. 434, § 167
-- Black's Law Dictionary