Refuel/ˌriːˈfjuːəl/ Definition 1 of 2Pro Tip 1/3Vehicles and Machines Used when vehicles or machines require more fuel to continue functioning. The airplane needed to refuel before the next flight. Pro Tip 2/3Transportation Context Commonly used in the context of travel and transportation to indicate a fuel stop. We'll need to refuel the truck halfway through our road trip. Pro Tip 3/3Fuel Type Refuel implies adding the same type of fuel that the vehicle or tool typically uses. The ship will refuel with diesel at the next port.