incursion
in|cur|sion /ɪnk'ɜːrʃən, -ʒən/ (incursions)
1 [N-COUNT] oft N into n
If there is an incursion into a country, enemy soldiers suddenly enter it. (FORMAL)
...armed incursions into border areas by rebel forces.
2 [N-COUNT] oft N of n
If someone or something enters an area where you would not expect them to be, or where they have not been found before, you can call this an incursion, especially when you disapprove of their presence. (FORMAL)
...her disastrous incursion into the property market.
1 [N-COUNT] oft N into n
If there is an incursion into a country, enemy soldiers suddenly enter it. (FORMAL)
...armed incursions into border areas by rebel forces.
2 [N-COUNT] oft N of n
If someone or something enters an area where you would not expect them to be, or where they have not been found before, you can call this an incursion, especially when you disapprove of their presence. (FORMAL)
...her disastrous incursion into the property market.