What does the word variation mean?

Usage examples for variation

  1. This variation is especially necessary in all dramatic expression. – Browning and the Dramatic Monologue by S. S. Curry
  2. Indeed, so marked was the variation that it was believed that the mean rainfall for all the observation stations on the basin did not bear sufficient relation to observed run- off to allow of any reliable deductions. – The Passaic Flood of 1903 by Marshall Ora Leighton