Dimension

A customer-definable tagging axis on postings — cost centre, project, contract, anything the chart of accounts cannot express — plus the native Scenario and Status axes, which every posting carries. Dimension values are data, not schema, so a new dimension needs no migration; cardinality is bounded by a tenant-configurable budget.

Canonical definition from the Ledgerbook glossary. Definitions are the product vocabulary — the same terms the API and MCP tools use.