1. in a way that is completely airtight or sealed
Usage: technical
2. in a way that is completely isolated or separated from outside influences
Usage: figurative

Examples

• The laboratory samples were hermetically sealed in glass containers.
• Food stored in hermetically sealed packages lasts much longer.
• The spacecraft was hermetically closed to maintain air pressure.
• The community lived hermetically, cut off from the outside world.
• The documents were hermetically preserved in the vault.
• She kept her personal life hermetically separate from her work.