intrusion
intrusions
1 If someone disturbs you when you are in a private place or having a private conversation, you can describe their behaviour as an  intrusion.
   I must ask your pardon for this intrusion.
COUNT N

2 An intrusion is also something that affects your work or way of life in an unwelcome way.
   ...the bank's intrusions into Mr Wheeler's operations.
   Government could enforce the law with minimal intrusion.
   COUNT N, UNCOUNT N