intrusion in WordNet English dictionary

1. entry to another's property without right or permission
   trespass  encroachment  violation  intrusion  usurpation 
   
2. any entry into an area not previously occupied
   "an invasion of tourists"; "an invasion of locusts"
   invasion  encroachment  intrusion 
   
3. entrance by force or without permission or welcome
   intrusion 
   
4. rock produced by an intrusive process
   intrusion 
   
5. the forcing of molten rock into fissures or between strata of an earlier rock formation
   intrusion