invade
1. [ verb ] (military) march aggressively into another's territory by military force for the purposes of conquest and occupation
Synonyms: occupy
Examples:

"Hitler invaded Poland on September 1, 1939"

Related terms: attack infest invader occupier
2. [ verb ] to intrude upon, infringe, encroach on, violate; This new colleague invades my territory"
Synonyms: obtrude_upon encroach_upon intrude_on
Examples:

"The neighbors intrude on your privacy"

Related terms: go_in enter foray_into invasion
3. [ verb ] occupy in large numbers or live on a host
Synonyms: overrun infest
Examples:

"cockroaches invaded my kitchen" "Ants overran the picnic table" "the Kudzu plant infests muchof the South" and is spreading to the North"

Related terms: inhabit infestation
4. [ verb ] penetrate or assault, in a harmful or injurious way
Examples:

"The cancer had invaded her lungs"

Related terms: interpenetrate invasion
Similar spelling:   invader
  innovate
  infidel
  invading
  inapt
  inpatient
  innovator
  inhabited
  inept
  inaptness