a person or thing that caps.
Also called topper. something that completes or adds to what has preceded it: The capper was that we didn't know each other after all.
Slang. an informer, especially for gamblers.
Slang. a by-bidder at an auction.

1350–1400 (for sense “cap maker”); 1580–90 (for def 1); Middle English; see cap1, -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cap (kæp)
1.  a covering for the head, esp a small close-fitting one made of cloth or knitted
2.  such a covering serving to identify the wearer's rank, occupation, etc: a nurse's cap
3.  something that protects or covers, esp a small lid or cover: lens cap
4.  an uppermost surface or part: the cap of a wave
5.  a.  See percussion cap
 b.  a small amount of explosive enclosed in paper and used in a toy gun
6.  chiefly (Brit) sport
 a.  an emblematic hat or beret given to someone chosen for a representative team: he has won three England caps
 b.  a player chosen for such a team
7.  the upper part of a pedestal in a classical order
8.  the roof of a windmill, sometimes in the form of a dome
9.  botany the pileus of a mushroom or toadstool
10.  hunting
 a.  money contributed to the funds of a hunt by a follower who is neither a subscriber nor a farmer, in return for a day's hunting
 b.  a collection taken at a meet of hounds, esp for a charity
11.  anatomy
 a.  the natural enamel covering a tooth
 b.  an artificial protective covering for a tooth
12.  See Dutch cap
13.  an upper financial limit
14.  a mortarboard when worn with a gown at an academic ceremony (esp in the phrase cap and gown)
15.  meteorol
 a.  the cloud covering the peak of a mountain
 b.  the transient top of detached clouds above an increasing cumulus
16.  cap in hand humbly, as when asking a favour
17.  (Brit) if the cap fits the allusion or criticism seems to be appropriate to a particular person
18.  set one's cap for, set one's cap at (of a woman) to be determined to win as a husband or lover
vb , caps, capping, capped
19.  to cover, as with a cap: snow capped the mountain tops
20.  informal to outdo; excel: your story caps them all; to cap an anecdote
21.  to cap it all to provide the finishing touch: we had sun, surf, cheap wine, and to cap it all a free car
22.  (Brit) sport to select (a player) for a representative team: he was capped 30 times by Scotland
23.  to seal off (an oil or gas well)
24.  to impose an upper limit on the level of increase of (a tax, such as the council tax): rate-capping
25.  hunting to ask (hunt followers) for a cap
26.  chiefly (Scot), (NZ) to award a degree to
[Old English cæppe, from Late Latin cappa hood, perhaps from Latin caput head]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
There must be something in us that wants finality, the dramatically satisfying capper to a star's life.
While last night's episode didn't match last week's, it was a nicely paced capper to the season's middle arc of episodes.
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