superelevation

noun su·per·el·e·va·tion \ ˌsü-pər-ˌe-lə-ˈvā-shən \

Definition of superelevation

1 : the vertical distance between the heights of inner and outer edges of highway pavement or railroad rails
2 : additional elevation

First Known Use of superelevation

1840

in the meaning defined at sense 1

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