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Webster 1913 Edition
Convergency
{ 
, Con-ver′gence
,Con-ver′gen-cy
}Noun.
 [Cf. F. 
convergence
.] 1. 
The condition or quality of converging; tendency to one point; the occurrence of two or more things coming together. 
The 
convergence 
or divergence of the rays falling on the pupil. Berkeley.
Webster 1828 Edition
Convergency
CONVERGENCE
, CONVERGENCY,Noun.