What does the word extension mean?

Usage examples for extension

  1. In more recent history it was the growth, extension, and severity of the police in controlling every activity of man that destroyed both the United States and Russia. – Eight Keys to Eden by Mark Irvin Clifton
  2. Lastly, the land re- emerged from the water, and, reaching a level somewhat above its present height, became connected with the continent of Europe, glaciers being formed once more in the higher regions, though the ice probably never regained its former extension. – The Student's Elements of Geology by Sir Charles Lyell
  3. Apparently there was a low extension in the rear. – Ulysses S. Grant by Walter Allen