Open English Wordnet
Nouns
(n)invasion, encroachment, intrusionany entry into an area not previously occupied“an invasion of tourists”, “an invasion of locusts”
(n)trespass, encroachment, violation, intrusion, usurpationentry to another's property without right or permission
(n)impingement, encroachment, impactinfluencing strongly“they resented the impingement of American values on European culture”