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English definition of “hermetic”

hermetic

adjective     /hɜːˈmet.ɪk/ US  /hɚˈmet̬-/
specialized engineering (of a container) so tightly closed that no air can leave or enter: a hermetic sealOpen and closed 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.Lifestyles and their study
(Definition of hermetic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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