vergency
noun
ver·gen·cy
| \ -nsē, -si\
plural -es
Definition of vergency
1
obsolete
: the act or process of verging, approaching, or bordering on something : tendency, inclination
2
: a measure of convergence or divergence of a pencil of rays entering or issuing from a lens or mirror that is expressed as the reciprocal of the distance from lens or mirror to the focus of the rays and for rays through a principal focus is equal to the focal power of the lens or mirror
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