tonnerEtymologyFrom ton + -er or tonne + -er.nounA vehicle or other object having a specified tonnage, or weighing a specified number of tons.“There came a welcome interruption, however, when I heard the roar of wheels and rejoiced to see my Leyland three-tonner come rolling and heaving over the grass, heaped up with tools and sections of tubing, and bearing my foreman, Peters, and a very grimy assistant in front.”