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vergence

[vur-juh ns] /ˈvɜr dʒəns/
noun, Ophthalmology
1.
the turning motion of the eyeballs toward or away from each other.
Compare convergence (def 4), divergence (def 3).
Origin
1900-1905
1900-05; verge2 + -ence
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for vergence

vergence

/ˈvɜːdʒəns/
noun
1.
the inward or outward turning movement of the eyes in convergence or divergence
Word Origin
C19: from verge² + -ence
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for vergence
n.

1902, from verge + -ence.

Online Etymology Dictionary, © 2010 Douglas Harper
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vergence in Medicine

vergence ver·gence (vûr'jəns)
n.
A disjunctive movement of the eyes in which the fixation axes are not parallel.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Difficulty index for vergence

Few English speakers likely know this word

Word Value for vergence

14
18
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