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1. The contraction of a vector field; also, a precise measure thereof. Compare confluence.
Mathematically, convergence is negative divergence, and the latter term is used for both. (For mathematical treatment, see divergence.)
2. The property of a sequence or series of numbers or functions which ensures that it will approach a definite finite limit.
A series representation of a mathematical function exhibits convergence if the sum of the terms of the series approaches the value of the function more closely as more terms of the series are taken, the two agreeing in the limit of an infinite number of terms.
3. Decrease in area or volume.


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use