intrusion intrusion /ˌɪnˈtruːʒən/

noun

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