Vergency

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]