Meaning of “hermetic” in the English Dictionary

"hermetic" in English

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uk /hɜːˈmet.ɪk/ us /hɚˈmet̬.ɪk/

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.
adverb /-i/

(Definition of “hermetic” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)