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grade separation

noun
1.
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.
Origin of grade separation
1930-1935
An Americanism dating back to 1930-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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7
8
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