convergence

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

• noun The act, condition, quality, or fact of converging.
• noun Mathematics The property or manner of approaching a limit, such as a point, line, function, or value.
• noun The point of converging; a meeting place.
• noun Physiology The coordinated turning of the eyes inward to focus on an object at close range.
• noun Biology The adaptive evolution of superficially similar structures, such as the wings of birds and insects, in unrelated species subjected to similar environments.

from The Century Dictionary.

• noun The character or fact of converging; tendency to one point; the fact of meeting in a point.
• noun In mathematics: The gradual and indefinite approximation of the sum of an infinite series toward a finite value. The scalar part of the result of performing upon any vector function the operation
• noun It is so called because, if the vector function be considered as representing the velocity and direction of a flowing fluid, the surface integral of this function over a closed surface, or the flow inward through that surface, is equal to the volume integral of the convergence within the surface. See curl.
• noun In biology, the manifestation of a tendency, among allied or diverse groups of organisms, to assume series of modifications by the same methods or along parallel lines, and with somewhat similar results.

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

• noun The condition or quality of converging; tendency to one point; the occurrence of two or more things coming together.
• noun (Math.) the approach of an infinite series to a finite limit.
• noun a representation of common ground between theories or phenomena.
• noun the act of converging (coming closer).
• noun (Biol.) a similarity of form or function in two or more organisms caused by evolutionary adaptations to a similarity in the environment, rather than to a common heredity.

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

• noun The act of moving toward union or uniformity.
• noun A meeting place.
• noun The intersection of three electron beams for red, green and blue onto a single pixel in a CRT.
• noun mathematics The process of approaching some limiting value.
• noun physiology The coordinated focusing of the eyes, especially at short range.
• noun biology The evolution of similar structures or traits in unrelated species in similar environments; convergent evolution.
• noun The merging of distinct technologies, industries, or devices into a unified whole.

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

• noun the act of converging (coming closer)
• noun a representation of common ground between theories or phenomena
• noun the approach of an infinite series to a finite limit
• noun the occurrence of two or more things coming together