Which term refers specifically to the process of removing an account from the system entirely?

The term that refers specifically to the process of removing an account from the system entirely is "decommission." Decommissioning an account typically involves not only disabling access but also ensuring that all data associated with the account is permanently erased or rendered inaccessible in such a way that it can no longer be retrieved or referenced. This step is critical for compliance with data protection regulations and ensures that sensitive information does not remain in the system longer than necessary.

In contrast, disabling an account means that the account is temporarily rendered inactive, allowing for potential future reactivation, but does not involve the permanent removal of all associated data. Archiving refers to storing data for long-term retention without it being active in the current system, allowing for later access, while transferring involves moving an account or its data from one location or user to another without removing it from the system. Therefore, for complete removal and unavailability of an account, "decommission" is the most appropriate term.