# intersection

Pronunciation: US say "IN-ter-sek-shun" /ˈɪntəɹˌsɛkʃən/; UK say "in-tuh-SEK-shun" /ˌɪntəˈsɛkʃən/

## Noun

1. The point where two or more roads, streets, or paths cross or join.
   - Simple: A place where two or more roads cross or meet.
   - _The city installed new traffic lights at the dangerous intersection downtown._
   - _Several intersections along the highway were redesigned to reduce accidents._
2. A point of overlap, confluence, or crossover between different things.
   - Simple: A place or moment where two different things meet or come together.
   - _The conference celebrated the intersection of food, music, and culture._
   - _Modern medicine increasingly works at the intersection of biology and computing._
3. The point or set of points shared by two geometric objects, such as where two lines meet or two planes cross.
   - Simple: The point or points where two lines or shapes meet.
   - _The students calculated the intersection of the two curves._
   - _Where the plane cut the cone, the intersection formed an ellipse._
4. The set containing all elements that belong to two or more sets at once.
   - Simple: All the items that belong to two or more groups at the same time.
   - _The intersection of set A and set B contains only the numbers found in both._
   - _If the two sets share no members, their intersection is empty._
5. The element in which two or more straight lines of synchronized skaters pass through each other.
   - Simple: A move where two lines of skaters pass through each other.
   - _The squad's intersection drew applause as the two lines glided through one another._
   - _A clean intersection requires precise timing from every skater on the ice._
6. The subobject formed by the pullback of two monomorphisms that share a common codomain.
   - Simple: In advanced math, the shared part of two smaller pieces inside the same object.
   - _The intersection of two subobjects is defined as the pullback of their inclusion monics._
   - _Here the intersection corresponds to the pullback completing the corner of the diagram._

## Origin

From Middle French "intersection" and its Latin source "intersectiō." By surface analysis, it can be read as "intersect" plus the suffix "-ion."

Source: DictionaryAI, https://dictionaryai.com/define/intersection (written from Wiktionary data, CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/).