What does the word insomuch mean?

Usage examples for insomuch

  1. For while we were looking and expecting, suddenly the table began to tilt this way and that, and then as if by an effort the ponderous mass, with all our hands still upon the velvet pall, positively mounted slowly into the air, insomuch that we were obliged to rise from our chairs and stand to reach the surface. – My Life as an Author by Martin Farquhar Tupper
  2. The night had by that time become profoundly dark, insomuch that we had to grope for the various articles we required. – The Big Otter by R.M. Ballantyne