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supermax

British  
/ ˈsuːpəˌmæks /

noun

  1. having or relating to the very highest levels of security

    a supermax jail

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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The 47-year-old lawyer promised to build supermax prisons in the Amazon while reinforcing the army to smash trafficking groups.

From The Wall Street Journal Jun. 1, 2026

The 68-year-old "El Chapo" is serving a life sentence at a supermax federal prison in Colorado following his 2016 arrest and 2019 conviction.

From Barron's Nov. 28, 2025

The BBC visited a high-security, supermax prison in Texas with Ms Mahmood in February.

From BBC May 22, 2025

On Tuesday, Doncic gave a Dallas reporter a wry smile when asked if he had given the Mavericks reason to believe he wouldn’t have signed the supermax extension he’d earned with the team.

From Los Angeles Times Feb. 4, 2025

And the odd thing is, the idea for a supermax is not new.

From "Newjack: Guarding Sing Sing" by Ted Conover

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