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  1. Dictionary
    Her·met·ic
    /hərˈmedik/

    adjective

    • 1. (of a seal or closure) complete and airtight: "a hermetic seal that ensures perfect waterproofing"
    • 2. relating to an ancient occult tradition encompassing alchemy, astrology, and theosophy: "some saw in the Hermetic texts an anticipation of Christianity"