mo·ped (m??p?d?)n.1. A lightweight motorized bicycle that can be pedaled as well as driven by a low-powered gasoline engine.2. A motor scooter.[From mo(tor) + ped(al).]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.moped (?m??p?d) n (Automotive Engineering) Brit a light motorcycle, not over 50cc[C20: from motor + pedal1, originally equipped with auxiliary pedals]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014mo?ped (?mo??p?d) n. a motorized bicycle with pedals that is designed for low-speed operation. [1955?60;