Ver″gen‐cy (?), n. 1. The act of verging or approaching; tendency; approach.
2. (Opt.) The reciprocal of the focal distance of a lens, used as measure of the divergence or convergence of a pencil of rays. Humphrey Lloyd.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.