Encroachment (noun)

1. An act or instance of encroaching; an intrusion or invasion.
2. The act or process of gradually taking over or intruding on a particular area or domain.

Origin:

From old french encroachier "to encroach", from en- "in" + crochier "to hook".

Examples:

1. The development of the new housing estate was seen as an encroachment on the countryside.
2. The company's expansion plans were met with concerns about encroachment on the wetlands.
3. The government's encroachment on civil liberties was a cause for concern.
4. The encroachment of the sea on the coast line was a result of climate change.
5. The city council was trying to prevent further encroachment on the park by developers.