intrusion

Etymology

From Middle English intrusioun, from Old French intrusion, from Medieval Latin intrūsiō, from intrūdō, from Latin in- + trūdō.

noun

1. The forcible inclusion or entry of an external group or individual; the act of intruding.
   She viewed sales calls as an unwelcome intrusion.
   The threat of terrorism to the British lies in the overreaction to it of British governments. Each one in turn clicks up the ratchet of surveillance, intrusion and security. Each one diminishes liberty. 2012-12-14, Simon Jenkins, “We mustn't overreact to North Korea boys' toys”, in The Guardian Weekly, volume 188, number 2, page 23
2. (geology) Magma forced into other rock formations; the rock formed when such magma solidifies.
3. A structure that lies within a historic district but is nonhistoric and irrelevant to the district.
   This setting is slightly altered by modern intrusion. 1969, The National Register of Historic Places, 1969, Washington, D.C.: National Park Service, page 275
   Although there are modern intrusions (a road and communications facilities on the summit), the mountain is important to the Kumeyaay community's belief system. 1997, Donna J. Seifert, Barbara J. Little, Beth L. Savage, John H., Jr. Sprinkle, “Defining boundaries for National Register properties”, in National Register Bulletin, Washington, D.C.: National Park Service, page 27
   In 1844, objection was raised to the Furness Railway's Dalton & Barrow line, when it was revealed that the line would pass directly through Furness Abbey. A re-route was achieved, with the line skirting the abbey ruins instead - although many continued to see the intrusion as a travesty against antiquity and the scenic beauty of the site. January 12 2022, Dr. Joseph Brennan, “Castles: ruined and redeemed by rail”, in RAIL, number 948, page 56
4. (phonology) The insertion of a phoneme into the pronunciation of a word despite its absence from the spelling. (e.g. intrusive r)
   A current challenge in recent work on Spanish sound structure is to understand the conditions that determine vowel intrusion and the consequences vowel intrusion may have on Spanish phonology. 2009, Benjamin Schmeiser, edited by Marine Vigário, Sónia Frota, and M. João Freitas, Phonetics and Phonology: Interactions and Interrelations, page 181