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Definition: 1. The point at which the sides of an angle intersect. 2. The point of a triangle, cone, or pyramid that is opposite to and farthest away from its base. 3. A point of a polyhedron at which three or more of the edges intersect.
Source: The American Heritage Science Dictionary. Boston: Houghton Mifflin, 2005. Credo Reference. Web. 17 August 2012.