This is the 862nd most frequent Japanese word.
超える
"To exceed," "to surpass," or "to go beyond."
Here, '超える' is used in the literal sense of crossing over or surpassing a physical object, the mountain.
彼は山を超える能力を持っています。
He has the ability to cross over a mountain.
In this case, '超える' is applied metaphorically to indicate surpassing an achievement or record.
その記録を超えるのは難しいでしょう。
It will likely be difficult to surpass that record.
Here, '超える' describes exceeding a defined limit, specifically the speed limit.