The phrase "odometer reading" refers to the number displayed on a device in a vehicle that measures the total distance it has traveled. Full definition
WASHINGTON — Carfax Vehicle History Service will report odometer readings at the time vehicles go through state emissions tests in order to detect odometer rollbacks. (articles.orlandosentinel.com)
The report also confirms ownership history in New York and Ohio, and corroborates mileage with 27 odometer readings from August 1997 to July 2014. (bringatrailer.com)
Matt Farah of The Smoking Tire got his hands on a 500E, and finds driving it is an extremely enjoyable experience, despite his example's 160,000 - mile odometer reading. (roadandtrack.com)