Definition
1 : relating to or characterized by occultism or abstruseness : recondite
2 a : airtight
b : impervious to external influence
c : recluse, solitary
Examples
The infomercial claimed that the new containers used modern technology to guarantee a hermetic seal that would keep food fresh for months.
"Later, as Western Europe welcomed foreign guest workers, Central Europe remained in the hermetic enclosure of Soviet rule." — Sara Miller Llana, The Christian Science Monitor, 10 Mar. 2016
