What does the word contagion mean?

Usage examples for contagion

  1. Maltravers caught the contagion, and laughed also. – Ernest Maltravers, Complete by Edward Bulwer-Lytton
  2. Frank had caught the contagion. – Frank of Freedom Hill by Samuel A. Derieux
  3. It fretted him, and the irritation that he felt extended like a contagion to his cabinet. – Stories Of Georgia 1896 by Joel Chandler Harris