Meaning of “intrusion” in the English Dictionary

(Definition of “intrusion” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"intrusion" in American English

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intrusion noun (GOING INTO A PLACE)

[ C/U ] the act of going into a place or becoming involved in a situation where you are not wanted or do not belong:

[ U ] They complained that building a new airport nearby would be a noisy intrusion on their quiet lives.

intrusion noun (FLOWING OF ROCK)

earth science [ U ] the flowing of hot melted rock into layers or cracks of rocks that already exist

(Definition of “intrusion” from the Cambridge Academic Content Dictionary © Cambridge University Press)