interloping means an act of intrusion or encroachment. Lexicurio rates it Sui generis — a strength score of 88 out of 100.
Why “interloping” is a great word
INTERLOPING — [Noun] An act of intrusion or encroachment, especially into a sphere of activity without legal right or authorization. Formed from the noun 'interloper' (from inter- (“between”) + -loper, probably from Middle Dutch lopen (“to run”)) + -ing, denoting the action or practice. Unlike interfering, which suggests meddling but not necessarily a breach of formal rights, or trespassing, which denotes a physical intrusion onto land, interloping is the unauthorized crossing of invisible boundaries of trade or privilege. It is the unlicensed merchant anchoring in a chartered company’s port, the stranger taking a seat at the head of the family table, and the amateur offering counsel in the hushed chambers of a guild—the quiet, profound violence of a presence that has no rightful place.
Etymology
Noun form of the word interloper (see that etymology for more), + -ing.
noun
- An act of intrusion or encroachment.“There was an interloping on my property.”
- Illegal Indian trade within the area over which the Hudson's Bay Company held a trade monopoly.