IPA: /əbˈtruːʒən/
KK: /əbˈtruːʒən/
An act of interfering or intruding into a space or situation where one is not welcome.
The obtrusion of the new building into the historic district caused a lot of controversy.
Obtrusion is formed from "ob-" (meaning against) and "trudere" (meaning to push). The word describes the act of pushing something against or into something else, often in an unwelcome or intrusive manner.
Think of something being 'pushed against' ('ob-') something else — that's why obtrusion means an unwelcome push or intrusion.