Definition of hermetic
1 often capitalized
a : of or relating to the mystical and alchemical writings or teachings arising in the first three centuries a.d. and attributed to Hermes Trismegistus
b : relating to or characterized by subjects that are mysterious and difficult to understand : relating to or characterized by occultism or abstruseness : recondite a hermetic discussion
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Time Traveler for hermetic
The first known use of hermetic was in 1605
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