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keep

Architecture the main tower within the walls of a medieval castle or fortress
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Keep

Inner tower of a castle.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

keep, donjon

keep
The stronghold of a medieval castle, usually in the form of a massive tower, and a place of residence, esp. in times of siege.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
With beds that need to remain filled, even immigrants who sign voluntary deportation agreements have been kept in detention centers past their release dates, as prison authorities claim they don't have the right paperwork to grant their release.