commutation ticket definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a ticket entitling the holder to travel over the same route, as on a railroad, a specified number of times at a reduced rate
commutation ticket definition by American Heritage Dictionary
A ticket issued at a reduced rate by a railroad or other transportation company for passage over a given route for a specified number of trips.