Other forms: sancta, sanctums
A sanctum is a sacred or very private place. The inner sanctum, his sanctum, retreat to the sanctum.
Inner sanctum is the fixed phrase and is used far more often than the plain word — it means the most private room and, figuratively, the closest circle around somebody powerful. In a temple the sanctum is the holiest part, entered by few. Note sanctuary and sanctify, from the same Latin; and that sanctum means simply a holy thing.
1nounsanctumA sacred or very private place.
“His study was his private sanctum, and the children were never allowed inside.”
sanctum is a private or sacred place.
Latin sanctum means that which is holy, from sancire, to make sacred. Saint, sanction and sanctuary come from the same holiness.
Latin
sanctum — that which is holy
English, today
sanctum
From Latin sanctum (“that which is holy”).
Etymology from Wiktionary, CC BY-SA