Definition from Wiktionary, the free dictionary
Alternative forms 
- (aviation) A piece of equipment that may be strapped to a person’s back and generate vertical thrust by a downward discharge of jet fluid, thereby rendering the person capable of flight.
Usage notes 
- (aviation): In formal use, one most often speaks or writes of using a jet pack; however, in informal use, it is not uncommon to hear of flying or riding a jet pack.
- (aviation): rocket pack
See also 
- (aviation): rocket belt