a finishing stone of a structure.
the crowning achievement, point, element, or event.
Contemporary Examples

Panetta’s Thankless New Job John Barry April 27, 2011
New York Passes Gay Marriage: This Is the Tipping Point John Avlon June 24, 2011
Weird Washington Monument History William O’Connor May 11, 2014
Bill de Blasio Mayoral Win Signals Working Families Party Ascendancy David Freedlander November 4, 2013
‘The Finish’: Mark Bowden on the Hunt for Osama bin Laden Doug Stanton October 14, 2012

Historical Examples

A Young Folks’ History of the Church of Jesus Christ of Latter-day Saints Nephi Anderson
George Eliot’s Life, Vol. I (of 3) George Eliot
The Life of Napoleon Bonaparte William Milligan Sloane
Charles Sumner; His Complete Works, Volume XI (of 20) Charles Sumner
Little Journeys To The Homes Of Great Teachers Elbert Hubbard

one of a set of slabs on the top of a wall, building, etc
(mountaineering) a chockstone occurring at the top of a gully or chimney
a crowning achievement; peak: the capstone of his career


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