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hermetic

her·met·ic [ hər méttik ] or her·met·i·cal [ hər méttik'l ]


adjective 
Definition:
 
1. airtight: so tightly or perfectly fitting as to exclude the passage of air

2. protected from outside influence: protected from or preventing any outside interference or influence
lead a solitary, hermetic existence

3. hard to understand: obscure and difficult for outsiders to understand

4. involving alchemy or magic: associated with alchemy or magic

[Mid-17th century. < modern Latin hermeticus<Hermes Trismegistus]

her·met·i·cal·ly adverb
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