noun. 1  The definition of a brain is the mass of nerve tissue located in the head of animals with spinal cords; it is the center of thought and controls movement. An example of brain is what is damaged when someone has Alzheimer's disease. 2  A brain is defined as a smart or intellectual person.
But there is something you can do to pass the retest: Drive your car. In January, Illinois initiated a new emissions test for cars from the 1996 model year and newer. Forget the dynamometer (treadmill) exhaust emissions test. The new test involves checking your gas cap, looking at the check-engine light and plugging a device into your car's diagnostic link.
Illinois EPA no longer sending emission test notices. Amid the Illinois budget crisis, the state Environmental Protection Agency is no longer sending out emissions test notices to vehicle owners. The tests are required when drivers try to renew their license plates, but the EPA stopped sending out the notices back in December.