What does the word antagonism mean?

Usage examples for antagonism

  1. There was antagonism between them. – The Trespasser by D.H. Lawrence
  2. When they are abroad, truth and error will be thrown into antagonism. – Rome, Turkey and Jerusalem by Edward Hoare
  3. He seemed aware of her secret antagonism, yet without resentment, waiting till it had died down before he spoke again. – The Romantic by May Sinclair