hermetic

What does "hermetic" mean?
The word "hermetic" describes something that is completely airtight or sealed off from the outside world. Think of a vacuum-sealed jar or a glass container that prevents air, moisture, or light from entering; physically, it implies a perfect, impenetrable seal. Metaphorically, it refers to ideas or social circles that are insular, mysterious, or difficult for outsiders to understand. When a person or a group is described as hermetic, it suggests they are reclusive or possess secret knowledge that is intentionally kept separate from common discourse.
"hermetic" in conversation
Discussing a high-end watch
The watch movement is encased in a hermetic chamber to protect it from moisture.
The watch movement is encased in a hermetic chamber to protect it from moisture.
That explains why it’s so expensive to service.
That explains why it’s so expensive to service.
Used here in its literal, technical sense regarding physical sealing.
Describing an exclusive academic circle
Their research group is quite hermetic; they rarely publish their findings.
Their research group is quite hermetic; they rarely publish their findings.
It’s almost impossible to get an invite to their seminars.
It’s almost impossible to get an invite to their seminars.
Used here to describe social and intellectual isolation.
"hermetic" in a sentence
The container is hermetic and keeps the food fresh for months.
The container is hermetic and keeps the food fresh for months.
He lived a hermetic life, rarely leaving his small apartment or speaking to neighbors.
He lived a hermetic life, rarely leaving his small apartment or speaking to neighbors.
The poet’s later work is notoriously hermetic, filled with obscure symbols that only he could decipher.
The poet’s later work is notoriously hermetic, filled with obscure symbols that only he could decipher.