separation of the levels at which roads, railroads, paths, etc., cross one another in order to prevent conflicting rows of traffic or the possibility of accidents.
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- grade iv astrocytoma,
- grade line,
- grade point,
- grade point average,
- grade school,
- graded post,
Origin of grade separation
An Americanism dating back to 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019