n. the horizontal distance between the front and rear axles of a road or rail vehicle.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the distance from the center of a car's front wheel to the rear axle
Word Usage
"The additional size outside and the 1. 5-inch longer wheelbase translates into more roominess inside, with anywhere from 1.75 inches to 2.7 inches more elbow, shoulder and knee room."