Definition of multigrade
1 : including or involving students from more than one grade level a multigrade classroom
2 of motor oil : having a viscosity range that allows use over a wide temperature range Due to the need for an oil that embodies both good lubrication at high temperatures and easy cranking in cold weather, multigrade oils have been developed. Basically, a multigrade oil is thinner at low temperatures and thicker at high temperatures.— Kevin M. G. Maher et al.
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