Definition of inner sanctum
somewhat formal
: a very private room or place
The new initiate was admitted to the club's inner sanctum.
—often used figuratively the inner sanctum of the CIA
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“Inner sanctum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/inner%20sanctum. Accessed 5 Aug. 2021.
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