"intrusion" in the noun sense
1. invasion, encroachment, intrusion
any entry into an area not previously occupied
"an invasion of tourists"
"an invasion of locusts"
2. intrusion
entrance by force or without permission or welcome
3. intrusion
the forcing of molten rock into fissures or between strata of an earlier rock formation
4. intrusion
rock produced by an intrusive process
5. trespass, encroachment, violation, intrusion, usurpation
entry to another's property without right or permission
Source: WordNet® (An amazing lexical database of English)
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