noun, plural lobbies.
an entrance hall, corridor, or vestibule, as in a public building, often serving as an anteroom; foyer.
a large public room or hall adjacent to a legislative chamber.
a group of persons who work or conduct a campaign to influence members of a legislature to vote according to the group's special interest.
verb (used without object), lobbied, lobbying.
to solicit or try to influence the votes of members of a legislative body.
verb (used with object), lobbied, lobbying.
to try to influence the actions of (public officials, especially legislators).
to urge or procure the passage of (a bill), by lobbying.

1545–55; < Medieval Latin lobia, laubia covered way < Old High German *laubia (later lauba) arbor, derivative of laub leaf

lobbyer, noun
unlobbied, adjective
unlobbying, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lobby (ˈlɒbɪ)
n , pl -bies
1.  a room or corridor used as an entrance hall, vestibule, etc
2.  chiefly (Brit) a hall in a legislative building used for meetings between the legislators and members of the public
3.  chiefly (Brit) Also called: division lobby one of two corridors in a legislative building in which members vote
4.  a group of persons who attempt to influence legislators on behalf of a particular interest
vb , -bies, -bies, -bying, -bied
5.  to attempt to influence (legislators, etc) in the formulation of policy
6.  (intr) to act in the manner of a lobbyist
7.  (tr) to apply pressure or influence for the passage of (a bill, etc)
[C16: from Medieval Latin lobia portico, from Old High German lauba arbor, from laub leaf]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1550s, from M.L. laubia, lobia "covered walk in a monastery," from a Gmc. source (cf. O.H.G. louba "hall, roof;" see lodge (n.)). Meaning "large entrance hall in a public building" is from 1640. Political sense of "those who seek to influence legislation" is attested 1808
in Amer.Eng., in ref. to the custom of influence-seekers gathering in large entrance-halls outside legislative chambers. The verb in this sense is first attested 1850.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

lobby definition

A group whose members share certain goals and work to bring about the passage, modification, or defeat of laws that affect these goals. Lobbies (also called interest groups or pressure groups) can be long-standing (such as minority groups struggling to have their civil rights guaranteed) or ad hoc (such as a community threatened by proposed construction of a nuclear power plant). Lobbies may use grassroots methods, such as local rallies and campaigns, to build support for their cause and often employ professional lobbyists, who testify before congressional committees and approach policymakers in all government branches. Powerful lobbies, such as the AFL-CIO and the American Legion, with millions of members, have succeeded in establishing influence in Washington, D.C.

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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Example sentences
Programs that permit the donation of good, unused drugs to the needy owe their
  existence to the lobbying by families of patients.
Co-ordination between political candidates and such lobbying groups is illegal.
It took him years of legal battling and lobbying to get permission to destroy
  the historic building.
There must be a more productive way of expressing their feelings and lobbying
  for change.
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