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a. A protocol followed in an emergency that involves confining people in a secure place, such as the confinement of prison inmates in cells after a disturbance, or the locking of students and teachers in classrooms after a violent attack.
b. A situation in which this protocol is undertaken.
2. A facility, such as a prison, where people considered to be dangerous are locked inside living quarters or otherwise confined.
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.


(Law) US a security measure in which those inside a building such as a prison, school, or hospital are required to remain confined in it for a time: many schools remained under lockdown yesterday.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



the confining of prisoners to their cells, as following a riot or other disturbance.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.lockdown - the act of confining prisoners to their cells (usually to regain control during a riot)
internment, imprisonment - the act of confining someone in a prison (or as if in a prison)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


lock-down [ˈlɒkdaʊn] n
to be in lockdown, to be under lockdown [place] → faire l'objet de mesures de confinement
to be on lockdown [prisoner] → être confiné(e) en cellule, être confiné(e) dans sa cellule
Collins English/French Electronic Resource. © HarperCollins Publishers 2005
References in periodicals archive ?
Chesswood also announces that it will enter into an automatic share purchase plan agreement (the 'ASPP') with a broker to allow for the purchase of Common Shares under the NCIB at times when Chesswood normally would not be active in the market due to regulatory restrictions or self-imposed trading blackout periods. Before entering into a blackout period, Chesswood may, but is not required to, instruct the designated broker to make purchases under the NCIB in accordance with the terms of the ASPP.
The blackout period between December 15 and January 10, 2020, is excluded from the offer.
Minimum holding period, blackout period and the requisite for prior approval for trading from compliance may be specified in employee trading guidelines to enhance the control environment.
Minimum holding period, blackout period and the requisite of prior approval for trading from compliance may be specified in employee trading guidelines to enhance the control environment.
The SEC revealed that while he was still on the job, Levoff on at least three occasions in 2010 and 2011 sent emails to company employees notifying them a blackout period was about to commence, and they were prohibited from trading Apple securities for the duration of the period.
The committee had announced violations by outlets during the media blackout period.
The rules also provide that the SSS should determine the need to implement a blackout period on any particular stock, and that SSC or SSS officials should secure a pre-clearance approval prior to the execution of a trade in any security.
Imposing a blackout period for foreigners to prioritize Koreans buying tickets for the upcoming national holiday between Feb 15 and 18 was discriminatory, others said.
The travel validity will be from July 15 until November 13, with a blackout period extending from August 24 to September 9.
Plan sponsors should also check with their existing and new recordkeepers about how they handle settlement/transaction confirmations during the blackout period. The documents should make it clear that the participants' funds have been transferred to a new provider; otherwise, participants may think their funds no longer exist.
Another Hollywood executive who is deeply embedded in China through joint ventures forecasts that the government-imposed blackout period, during which only Chinese movies are allowed to be released, will be much shorter this year than in 2015, because Hollywood movies are performing so much worse.