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capstone

[kap-stohn] /ˈkæpˌstoʊn/
noun
1.
a finishing stone of a structure.
2.
the crowning achievement, point, element, or event.
Origin
1350-1400
1350-1400; Middle English. See cap1, stone
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cap-stone

capstone

/ˈkæpˌstəʊn/
noun
1.
one of a set of slabs on the top of a wall, building, etc
2.
(mountaineering) a chockstone occurring at the top of a gully or chimney
3.
a crowning achievement; peak the capstone of his career
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 cap-stone

capstone

n.

also cap-stone, topmost stone in a construction, 1680s, from cap + stone (n.). Earliest use is figurative.

Online Etymology Dictionary, © 2010 Douglas Harper
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7
9
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