Definitions
1.NounA vehicle somewhat like a moped, having a small motor where the pedals would be, and a petrol tank located within the frame.
2.NounA three-wheeled vehicle controlled with a steering wheel and foot pedals for acceleration and braking, where passengers ride in seats instead of astride the body.
3.NounA hybrid between motorcycle and automobile, with a drive system like a motorcycle and rider amenities like a car.
4.NounA cycle in rock formation whose major forces are contained within the formation, as contrasted with coming from outside the formation via tectonics, volcanism, climate change, or other outside forces.