What is a Dimension?
A Dimension is a structural attribute of a Cube that is a list of related names–known as Members–all of which belong to a similar category in the user’s perception of a data. For example, months and quarters may make up a Months dimension; likewise all cities, regions and countries may make up a Region dimension. A Dimension acts an index for identifying values within a multidimensional array and offers a very concise, intuitive way of organizing and selecting data for retrieval, exploration and analysis. Dimensions are the business parameters normally seen in the rows and columns of a report.