adj. 1. Completely sealed, especially against the escape or entry of air. 2. Impervious to outside interference or influence: the hermetic confines of an isolated life. 3. often Hermetic a. Mythology Of or relating to Hermes Trismegistus or the works ascribed to him. b. Having to do with the occult sciences, especially alchemy; magical. [New Latin hermēticus, alchemical, from Medieval Latin Hermēs (Trismegistus); see HERMES TRISMEGISTUS.] her·meti·cal·ly adv. |
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