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From The Collaborative International Dictionary of English v.0.48:
Vergency \Ver"gen*cy\, n. 1. The act of verging or approaching; tendency; approach. [R.] [1913 Webster] 2. (Opt.) The reciprocal of the focal distance of a lens, used as measure of the divergence or convergence of a pencil of rays. [R.] --Humphrey Lloyd. [1913 Webster]