intersection

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act, process, or result of intersecting.
• noun A place where things intersect, especially a place where two or more roads cross.
• noun The point or locus of points where one line, surface, or solid crosses another.
• noun A set that contains elements shared by two or more given sets.

from The Century Dictionary.

• noun The act of intersecting; a cutting or dividing, or cutting across: as, the intersection of a map by lines of latitude and longitude.
• noun A place of crossing; specifically, a point common to two lines or a line and a surface, or a line common to two surfaces: as, a house at the intersection of two roads; the intersection of two geometrical lines or figures.
• noun In logic, the relation of two classes each of which partly excludes and partly includes the other.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act, state, or place of intersecting.
• noun (Geom.) The point or line in which one line or surface cuts another.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The junction of two (or more) paths, streets, highways, or other thoroughfares.
• noun geometry The point or set of points common to two geometrical objects (such as the point where two lines meet or the line where two planes intersect).
• noun set theory The set containing all the elements that are common to two or more sets.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a point where lines intersect
• noun a junction where one street or road crosses another
• noun a representation of common ground between theories or phenomena
• noun the act of intersecting (as joining by causing your path to intersect your target's path)
• noun a point or set of points common to two or more geometric configurations
• noun the set of elements common to two or more sets