Plain English Meaning
The distance from the front wheel to the back wheels of the airplane, measured along the length of the aircraft. A longer wheelbase means a bigger turning circle on the ground.
Full Definition
The straight-line distance between the nose wheel (or tail wheel) and the main landing gear of an aircraft, measured along the longitudinal axis. Wheelbase length affects ground handling characteristics, including turning radius and directional stability while taxiing.
Context Anchor
Seen in landing gear and aircraft design discussions, especially when explaining how an aircraft sits, taxis, turns, or handles on the ground.