in ‧ tru ‧ sion /ɪnˈtruːʒ ə n/ BrE AmE noun [uncountable and countable]
1 . when someone does something, or something happens, that affects your private life or activities in an unwanted way
intrusion into/on/upon
I resented this intrusion into my domestic affairs.
the unwelcome intrusion of the press
2 . when something comes into a place or situation and has an unwanted effect:
the intrusion of badly designed new buildings in the historic high street