dungeon

noun

dun·​geon ˈdən-jən 

1

: donjon

2

: a dark usually underground prison or vault

Did you know?

The words for two different parts of a castle come from the same source. The word dungeon, meaning “a dark usually underground prison,” comes from the French word donjon, which also gives us our English word donjon, meaning “an inner tower in a castle.” Dungeon was first used in English in the 14th century for the strong tower in the inner part of the castle. Defenders could retreat to this tower if attackers got inside the castle walls. Part of the tower usually included an underground room, the dungeon, usually used for prisoners. Throughout its history, the word dungeon has had many spellings. Sometimes it was spelled donjon like the French word it comes from, and sometimes in other ways. In time the spelling donjon came to be used mostly for the castle tower, and the spelling dungeon mostly for the underground room or prison.

Examples of dungeon in a Sentence

The king threw them in the dungeon.

Recent Examples on the Web

Released to critical acclaim in February 2022, Elden Ring is an action RPG set in an authentic dark fantasy world, which allows players to head off on adventures within vast environments and dungeons. —Justin Kroll, Deadline, 20 Apr. 2026

As the castle’s internal order collapses under the weight of a string of baffling crimes, Araki strikes a fragile alliance with Kuroda Kanbei – a razor-minded captive languishing in his own dungeon – in a race to root out a traitor before Oda’s army closes in. —Naman Ramachandran, Variety, 14 Apr. 2026

The businessman and father was living in kind of a hell associated with a Third World dungeon -- complete with racial slurs. —Troy Roberts, CBS News, 8 Apr. 2026

Macabre possibilities haunted us at night, Piranesian visions of dungeons and interrogation chambers. —Daniel Brook, Harpers Magazine, 24 Mar. 2026

Word History

Etymology

Middle English dongeon, donjon, from Anglo-French donjun, from Vulgar Latin *domnion-, domnio keep, mastery, from Latin dominus lord — more at dominate

First Known Use

14th century, in the meaning defined at sense 1

Phrases Containing dungeon

• dungeon crawler

Kids Definition

dungeon

noun

dun·​geon ˈdən-jən 

1

: donjon

2

: a dark usually underground prison

Etymology

Middle English donjon "tower in a castle, dungeon," from early French donjon "castle tower" — related to donjon

Word Origin

The word dungeon, in use in English since the 1300s, originally referred to the keep of a castle—the massive inner tower detached from the rest of the structure that was its most securely located and protected part. During its early history this word had about a dozen different spellings, but nowadays, in the sense of a castle's keep, the usual form is donjon. The donjon was the stronghold to which the residents of the castle retreated if the outer walls had been scaled or breached in a siege. The subterranean part of a donjon was called by the same word in the form dungeon, the usual spelling for this sense. This dark, damp chamber was used as a cell for the confinement of prisoners. Both donjon and dungeon are borrowed from medieval French donjon, most likely the descendant of an unrecorded spoken Latin form domnio, ultimately a derivative of Latin dominus, "lord." The underlying sense of domnio would have been "dominating tower," reflecting the relation between the keep and the rest of the castle.