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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.


(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.



the confining of prisoners to their cells, as following a riot or other disturbance.
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)


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
References in periodicals archive ?
If Alfred Nobel is to continue the Ballydoyle monopoly, he will have to overcome the Ger Lyons-trained threetime victor Love Lockdown, and other previous winners in Kitty Kiernan, trained by Jim Bolger, the Kevin Prendergasttrained King Ledley, and Moran Gra, who finished fourth to Canford Cliffs in the Coventry Stakes at Royal Ascot 12 days ago.
The Director General of NSW Health, Professor Debora Picone, has described the extended lockdown of mentally ill patients at Long Bay Prison Hospital as 'not acceptable' and expressed admiration for nurses' stand against the lockdowns.
Specially-trained search teams have been brought in to scour a Midland category C prison, which was last night under a full lockdown.
But prison officials today confirmed the lockdown at Featherstone Prison, near Wolverhampton, was now over.
With the addition of AMM, LockDown can deriver and receive critical communications from wireless or wireline enabLed devices such as cell phones, pagers, Blackberry devices, and internal or external phone systems, as well as from the web or a PC.
CASTAIC -- The East Facility of Pitchess Detention Center remained on lockdown Friday after a disturbance Thursday afternoon left 40 inmates injured, including 16 who were treated at hospitals.
If the national terrorism threat level were ever to go to "Code Red," the country would "go into lockdown mode," related a March 30, 2003 Scripps-Howard story.
The lockdown means all inmates are locked in their cells and all volunteer activities and most extra activities are suspended.
2, the newest version of CyberGuard's Content Security Management Suite, also delivers a unique 'One-Click Lockdown' feature which enables organizations to weather heavy attacks by triggering a lockdown of vulnerable areas of the network while allowing necessary applications to run uninterrupted.
The detainees alleged that during monthly lockdown searches of the jail, they were confined for 48 to 50 hours at a time to their cells, where they were not under observation or within hailing distance of correctional officers.
Benitz says the company's patented LockDown device is a heavy-duty 12 gauge, corrosion-resistant stainless steel "pan" that fits into a manhole's opening.
Cisco IOS AutoSecure: This innovative Cisco IOS Software command-line-interface (CLI) based feature provides "one touch" router lockdown.