domain

1. [Computer System] A shared user authorization database that contains users, groups, and their security policies.

2. [Fibre Channel]

The portion of the Fibre Channel address identifier that represents the highest level in the three-level addressing hierarchy.

A domain typically is associated with a single Fibre Channel Switch.

3. [Network]

A set of interconnected network elements and addresses that are administered together and that may communicate.

4. [NVMe]

The smallest indivisible unit of an NVM subsystem that has a common state.