Meaning of invasion in English
1. the entry of armed forces into another country in order to attack and conquer it
The Soviet invasion of Poland on 17 September 1939 was a military operation by the Soviet Union without a formal declaration of war.
2. a situation in which one puts oneself deliberately into a place or situation where one is unwelcome or uninvited; interference or intrusion
The loud music from next door is an invasion of our privacy.