# Constituent Elements

| Element                                                                                                                                                                                    | Definition                                                   |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------ |
| [Hierarchy](https://docs.pentaho.com/install/9.3-install/multidimensional-data-modeling-in-pentaho/about-multidimensional-expression-language/mondrian-schema-element-reference/hierarchy) | The hierarchies (pre-defined drill-downs) for this dimension |