noun, plural caucuses.
U.S. politics.
a meeting of party leaders to select candidates, elect convention delegates, etc.
a meeting of party members within a legislative body to select leaders and determine strategy.
(often initial capital letter) a faction within a legislative body that pursues its interests through the legislative process: the Women's Caucus; the Black Caucus.
any group or meeting organized to further a special interest or cause.
verb (used without object)
to hold or meet in a caucus.
verb (used with object)
to bring up or hold for discussion in a caucus: The subject was caucused. The group caucused the meeting.

1755–65, Americanism; apparently first used in the name of the Caucus Club of colonial Boston; perhaps < Medieval Latin caucus drinking vessel, Late Latin caucum < Greek kaûkos; alleged Virginia Algonquian orig. less probable Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
caucus (ˈkɔːkəs)
n , pl -cuses
1.  chiefly (US), (Canadian)
 a.  a closed meeting of the members of one party in a legislative chamber, etc, to coordinate policy, choose candidates, etc
 b.  such a bloc of politicians: the Democratic caucus in Congress
2.  chiefly (US)
 a.  a group of leading politicians of one party
 b.  a meeting of such a group
3.  chiefly (US) a local meeting of party members
4.  (Brit) a group or faction within a larger group, esp a political party, who discuss tactics, choose candidates, etc
5.  (Austral) a group of MPs from one party who meet to discuss tactics, etc
6.  (NZ) a formal meeting of all Members of Parliament belonging to one political party
7.  (intr) to hold a caucus
[C18: probably of Algonquian origin; related to caucauasu adviser]

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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Word Origin & History

1763, Amer.Eng., perhaps from caucauasu "counselor" in the Algonquian dialect of Virginia, or the Caucus Club of Boston, a 1760s social & political club whose name possibly derived from Mod.Gr. kaukos "drinking cup." Another candidate is caulker's (meeting). The verb is from 1850.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
caucus [(kaw-kuhs)]

A meeting of members of a political party to nominate candidates, choose convention delegates, plan campaign tactics, determine party policy, or select leaders for a legislature.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


any political group or meeting organized to further a special interest or cause

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It will welcome you, and so will the caucus of lucid malcontents.
But the straw poll isn't often an indicator of who will go on to win the caucus.
Most aren't known outside their own districts and tend to vote with their party
As little as a week before the caucus the polls were still showing him in
  fourth or fifth place.
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