multigrade

adjective
mul·​ti·​grade | \ ˌməl-tē-ˈgrād How to pronounce multigrade (audio) , -ˌtī-\

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.

First Known Use of multigrade

1949, in the meaning defined at sense 1

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The first known use of multigrade was in 1949

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