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[in-ter-sek-shuh n] /ˌɪn tərˈsɛk ʃən/
a place where two or more roads meet, especially when at least one is a major highway; junction.
any place of intersection or the act or fact of intersecting.
  1. Also called meet, product. the set of elements that two or more sets have in common. Symbol: ∩.
  2. the greatest lower bound of two elements in a lattice.
1550-60; < Latin intersectiōn- (stem of intersectiō). See intersect, -ion
Related forms
intersectional, adjective
nonintersectional, adjective
1. crossroads, crossing, corner. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for intersection
  • Cross the bridge and walk straight ahead to the intersection.
  • Entrance and exit ramps connect the streets at every intersection.
  • It continues to be a city that creates its own history at the intersection where both continents meet.
  • He wants to show me a favorite intersection he designed.
  • Spotting a trend at the intersection of technology and romance.
  • We typically seek projects engaging one or more big questions lying within and at the intersection of multiple disciplines.
  • Most rear-end, road-departure, lane-change and intersection accidents are preventable.
  • The police said the officers had a green light at the intersection when the accident occurred.
  • It looks at the intersection of gender and race, among other things.
  • Credit economists focusing on the intersection of macroeconomics and finance.
British Dictionary definitions for intersection


/ˌɪntəˈsɛkʃən; ˈɪntəˌsɛk-/
a point at which things intersect, esp a road junction
the act of intersecting or the state of being intersected
  1. a point or set of points common to two or more geometric configurations
  2. Also called product. the set of elements that are common to two sets
  3. the operation that yields that set from a pair of given sets. Symbol: ∩, as in AB
Derived Forms
intersectional, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for intersection

"act or fact of crossing," 1550s, from Middle French intersection (14c.) and directly from Latin intersectionem (nominative intersectio) "a cutting asunder, intersection," noun of action from past participle stem of intersecare "intersect, cut asunder," from inter- "between" (see inter-) + 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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intersection in Science
  1. The point or set of points where one line, surface, or solid crosses another.

  2. 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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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