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1. Entrance by force or without permission or welcome
    
2. Entry to another's property without right or permission
   - trespass, encroachment, violation, usurpation
    
3. Any entry into an area not previously occupied
   "an intrusion of tourists";
   - invasion, encroachment
    
4. Act or process of interfering in the affairs of others when it is unwanted or annoying
   "she was annoyed by the neighbour's intrusion";
   - interference, meddling
    
5. The forcing of molten rock into fissures or between strata of an earlier rock formation
    
6. Rock produced by an intrusive process

Derived forms: intrusions

Type of: actus reus, entering, entrance, entry, geologic process, geological process, incoming, ingress, misconduct, rock, stone, wrongdoing, wrongful conduct

Encyclopedia: Intrusion