invade

Concise Oxford English Dictionary © 2008 Oxford University Press:
invade/ɪnˈveɪd/

▶verb

• 1 enter (a country) as or with an army so as to subjugate or occupy it.

  ■ enter in large numbers, especially intrusively.

  ■ (of a parasite or disease) attack and spread into (an organism or bodily part).

• 2 intrude on: he felt his privacy was being invaded.

– derivatives
invader noun.

– origin ME: from L. invadere, from in- ‘into’ + vadere ‘go’.