What does the word intensity mean?

Usage examples for intensity

  1. She shook all over, and she gazed with piercing intensity at the man. – The U.P. Trail by Zane Grey
  2. His eyes were small, but sparkling like an Indian's, and, when they could be seen, were fixed with frightful intensity upon the Rifleman. – The Riflemen of the Miami by Edward S. Ellis
  3. Emmet laughed, but almost immediately the intensity of his mood returned. – The Mayor of Warwick by Herbert M. Hopkins