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vergency
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]
