The angle that a gun must be elevated above the line of its target to allow for the effect of gravity on the projectile(noun)
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Use "superelevation" in a sentence
"It should not be at the top of ballast, this slope should be determined by the rail superelevation."
"Cross slopes can be varied using gradings transitions, but if circumstances required using superelevation parameters then this approach needs some help."
"It has it's uses when stuff other than normal superelevation needs to happen, or to get intermediate design values say to extract a projected Edge pavement profile, from the corridor, and then adjust it to fit design constraints."