Top Definition
National Institute for Automotive Service Excellence Certified Master Automotive Technician.

To attain such status a technician with at least 2 years experience must elect to take and pass a series of 8 written tests put on by the National Institute for Automotive Service Excellence. To maintain such status the technician must also retake recertification tests which are shorter but tend to be more difficult every 5 years.
Take your car to Bob's Garage and have Tim look at it, he's an ASE CMAT.
by adtmatt May 27, 2010
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