sanc ‧ tum /ˈsæŋktəm/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: Late Latin ; Origin: Latin sanctus ; ⇨ ↑ saint ]
1 . inner sanctum a private place or room that only a few important people are allowed to enter – often used humorously:
Occasionally, she would be allowed into the inner sanctum of his office.
2 . a holy place inside a temple