a position of power, strength, or success权势显赫,处尊居显;优势,支配地位
They are in danger of losing their political ascendancy (= controlling power).他们的政治权位岌岌可危。
Supporters of the proposal are currently in the ascendancy over its opponents (= are more powerful than them).提案的支持者目前占据上风(压倒了反对者)。