osculation

[os-kyuh-ley-shuhn]
noun
1.
the act of kissing.
2.
a kiss.
3.
close contact.
4.
Geometry. the contact between two osculating curves or the like.

Origin:
1650–60; < Latin ōsculātiōn- (stem of ōsculātiō) a kissing, equivalent to ōsculāt(us) (see osculate) + -iōn- -ion

auscultation, osculation.
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World English Dictionary
osculation (ˌɒskjʊˈleɪʃən)
 
n
1.  maths Also called: tacnode a point at which two branches of a curve have a common tangent, each branch extending in both directions of the tangent
2.  rare the act or an instance of kissing
 
osculatory
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

osculation
"kissing, a kiss," 1650s, from L. osculationem, noun of action from osculari (see osculate).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The integration of motion starts from an osculation epoch at which the orbit of the primary fragment is known.
Such osculation should be severely rebuked by the courts.
The higher quotations obtaining on clerical osculation will he duly noted.
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