intrusion

noun

1. 1

   entrance by force or without permission or welcome

2. 2

   entry to another's property without right or permission

3. 3

   any entry into an area not previously occupied

   an invasion of tourists

   an invasion of locusts

4. 4

   rock produced by an intrusive process

5. 5

   the forcing of molten rock into fissures or between strata of an earlier rock formation