What does the word adage mean?

Usage examples for adage

  1. I set much store by the old adage that well begun is half done. – Poor Relations by Compton Mackenzie
  2. All history has proved this adage true. – The Song of the Exile--A Canadian Epic by Wilfred S. Skeats
  3. The whole of our gun- boats fired at him as he passed, and knocked the water up about him in all directions without ever once touching him, although, to look at him, one would have imagined it impossible he could escape; but here the old soldier's adage was verified, for there was still more room to miss than to hit him, and he accordingly escaped scot- free. – Twenty-Five Years in the Rifle Brigade by William Surtees