Accordingly to TOGAF, The highest level (typically) of description of an organization and typically covers all missions and functions. An enterprise will often span multiple organizations. In many cases it can referred as entire business of an organization.
An indicator or factor that can be tracked, usually on an ongoing basis, to determine success or alignment with objectives and goals.
A logical collection of Measurements applied to goals or objectives for an Enterprise. The measurement area provides grouping of measurement for ease of understanding, and use.
The entity Value could be used to capture the quantifiable impact of an Initiative on a Metric and thus help to evaluate the Business Case results.