Multidimensional means having several dimensions or aspects. In the OLAP world, it pertains to the ability to deal with or manipulate views of several Dimensions and look at the data from many different angles or perspectives.  OLAP Cubes are therefore considered to be multidimensional, in that they contact data modeled in such a way that users can report, analyze and plan by, for example, the dimensions Region, Year, Month, Sales Amount, Version, etc.