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n. pl. cau·cus·es or cau·cus·ses
a. A meeting of the local members of a political party especially to select delegates to a convention or register preferences for candidates running for office.
b. A closed meeting of party members within a legislative body to decide on questions of policy or leadership.
c. A group within a legislative or decision-making body seeking to represent a specific interest or influence a particular area of policy: a minority caucus.
2. Chiefly British A committee within a political party charged with determining policy.
v. cau·cused, cau·cus·ing, cau·cus·es or cau·cussed or cau·cus·sing or cau·cus·ses
To assemble in or hold a caucus.
To assemble or canvass (members of a caucus).

[After the Caucus Club of Boston, an influential Colonial political organization around the time of the American Revolution , perhaps from Medieval Latin caucus, drinking vessel, variant of Latin caucum; akin to Greek kaukos (both Greek and Latin being borrowed from the same unknown source).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Government, Politics & Diplomacy) the act of holding a private, often secret meeting of members of a political party prior to an election or general party meeting
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014