A wheelbase is defined as the distance between the centers of the front and rear wheels on a vehicle. It is an important measurement that impacts a vehicle's stability and handling. There are several synonyms for wheelbase, including track length, tread, chassis length, and axel span. Track length refers to the distance between the centers of the left and right wheels on an axle. Tread refers to the distance between the outer edges of the tires. Chassis length is the overall distance between the front and rear of a vehicle's frame. Axel span refers to the distance between the two axels on a vehicle. All of these synonyms are essential to know when discussing a vehicle's specifications and comparing different models.