Which term refers to something that is completely sealed?

The term that refers to something that is completely sealed is "hermetic." This word originates from Hermes Trismegistus, a mythical figure associated with alchemy and magic, known for his secrecy and knowledge. In modern usage, "hermetic" is often employed to describe containers or environments that are airtight or impervious to outside influences, making it suitable for contexts involving preservation or protection from contamination.

The other options, while each possessing their own meanings, do not align with the definition of something being completely sealed. "Exegesis" pertains to critical interpretation or explanation of a text, particularly religious scriptures. "Gambol" refers to playful, energetic movement or skipping, and "gauche" describes something lacking social grace or sensitivity. Thus, in the context of completeness and sealing, "hermetic" is the only term that fits accurately.