# intersection

## intersection

[in-ter-sek-shuhn]
noun
1.
a place where two or more roads meet, especially when at least one is a major highway; junction.
2.
any place of intersection or the act or fact of intersecting.
3.
Mathematics.
a.
Also called meet, the set of elements that two or more sets have in common. Symbol:
b.
the greatest lower bound of two elements in a lattice.

Origin:
1550–60; < Latin intersectiōn- (stem of intersectiō). See intersect, -ion

1. crossroads, crossing, corner.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
 intersection (ˌɪntəˈsɛkʃən, ˈɪntəˌsɛk-) —n 1. a point at which things intersect, esp a road junction 2. the act of intersecting or the state of being intersected 3. maths a.  a point or set of points common to two or more geometric configurations b.  Also called: product the set of elements that are common to two sets c.  the operation that yields that set from a pair of given sets. Symbol: ∩, as in A ∩ B inter'sectional —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

intersection
1550s, from L. intersectionem (nom. intersectio) "a cutting asunder, intersection," from intersectus, pp. of intersecare "intersect, cut asunder," from inter- "between" + secare "to cut" (see section). Originally a term in geometry, meaning "crossroads" is from 1864.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
 intersection   (ĭn'tər-sěk'shən)  Pronunciation Key  The point or set of points where one line, surface, or solid crosses another. The set that contains only those elements shared by two or more sets. The intersection of the sets {3,4,5,6} and {4,6,8,10} is the set {4,6}. The symbol for intersection is . Compare union.
The American Heritage® Science Dictionary