What does the word ascendency mean?

Usage examples for ascendency

  1. If chemical action obtains the ascendency, it acts as a poison. – The American Reformed Cattle Doctor by George Dadd
  2. The Whigs looked upon the invasion of Mexico as a piratical attempt of the Democratic leaders to secure the permanent ascendency of their party, and this was probably the true reason for Franklin Pierce's joining it. – The Life and Genius of Nathaniel Hawthorne by Frank Preston Stearns
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