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English definition of “hermetic”

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hermetic

adjective uk   /hɜːˈmet.ɪk/ us    /hɚˈmet̬-/
specialized engineering (of a container) so tightly closed that no air can leave or enter: a hermetic seal formal If a particular group is hermetic, the people who live within it don't often communicate with those who live outside it: He entered the hermetic world of the monastery at a young age.
(Definition of hermetic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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