Completely sealed or airtight; isolated from outside influences or difficult to understand. Can describe both physical containment and intellectual inaccessibility.
From Latin 'hermeticus,' referring to Hermes Trismegistus, a legendary figure associated with alchemy and secret knowledge. Alchemical containers were 'hermetically sealed' to prevent contamination, leading to the modern meaning of airtight or isolated.
Think of Hermes, the messenger god, but imagine he's keeping secrets instead of delivering messages — hermetic knowledge is sealed away from the outside world. Like a hermit's cave that's sealed tight from external influence.
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