invasion

noun4

1. •
   a military attack in which one country sends soldiers into another to take land or power

   • The invasion and armed suppression, on one occasion after another, of nations seeking to be free was quite consistent with Lenin's views. — 1978
2. •
   The entry without consent of an individual or group into an area where they are not wanted.

   • an invasion of mobile phones
   • an invasion of foreign tourists
3. •
   The spread of cancer cells, bacteria and such to the organism.
4. •
   The breaching of the skin barrier.