This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The confinement of prison inmates to their cells as a security measure following a disturbance in the prison.

n. A prison, especially a high-security one.

n. A device that secures a piece of equipment, especially a computer, so that it cannot be moved or stolen.

n. The confinement of people in their own rooms (or cells) as a security measure after a disturbance

n. A contrivance to fasten logs together in rafting.

"He never really had to go into what I call lockdown."

imprisonment    internment   

now-useless    sorceress    nefittifi    intensive-care    after