noun

• The junction of two (or more) paths, streets, highways, or other thoroughfares.
• Any overlap, confluence, or crossover.
• (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).
• (set theory) The set containing all the elements that are common to two or more sets.
• (sports) The element where two or more straight lines of synchronized skaters pass through each other.http://www.isu.org/vsite/vcontent/content/transnews/0,10869,4844-128590-19728-18885-295370-3787-4771-layout160-129898-news-item,00.html
• (category theory) The pullback of a corner of monics.