Lockdown meaning

lŏkdoun
An emergency security procedure in which prison inmates are locked in their cells and denied the usual privileges of dining, showering, etc. outside of them.
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A facility, such as a prison, where people considered to be dangerous are locked inside living quarters or otherwise confined.
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The confinement of prisoners to their cells for the duration of a security alert caused by events or conditions at the prison.
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(in an institution, such as a prison or school) The confinement of people in their own rooms (cells) as a security measure after a disturbance.
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(US) A contrivance to fasten logs together in rafting.
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Any emergency security procedure in which authorities prohibit persons from leaving a building, compound, etc.
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Origin of lockdown