vergency

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English

Etymology

verge + -ency, cf. New Latin vergentia (16th century), French vergence (18th century) and later English vergence (20th century).

Pronunciation

Noun

vergency (plural vergencies)

  1. (dated) The act of verging or approaching; tendency, inclination towards something.
    • 1668, John Wilkins, An Alphabetical Dictionary: Wherein All English Words According to Their Various Significations, are Either Referred to Their Places in the Philosophical Tables, Or Explained by Such Words as are in Those Tables, J.M:
    • 1704, Plutarch's Morals, volume 3, London: Thomas Braddyll, page 155:
      • "the Earth is moved about the Sun by its Inclination and Vergency towards it"
    • 1721 Nathan Bailey, An Universal Etymological English Dictionary, E. Bell, London.
      • "VERGENCY a bending or declining away, from or to, inclining."
  2. The reciprocal of the focal distance of a lens, used as a measure of the divergence or convergence of a pencil of rays.
    • 1863, The Civil Engineer and Architect's Journal:
      When, by the pencil becoming oblique to the surface, the vergency produced on the pencil becomes changed, the primary and secondary focal points, V and H, separate []

Synonyms