The definition of ascendancy is a position of domination.
An example of ascendancy is being a king.
a position in which one has control or power; supremacy; domination
also as·cend′ance or as·cend′ence
Superiority or decisive advantage; domination: “Germany only awaits trade revival to gain an immense mercantile ascendancy” ( Winston S. Churchill )
- candy canes
From ascendant + -cy