Combined access means the days included with your Ikon Pass or Ikon Base Pass are shared across multiple mountains or ski areas at one destination, rather than counted separately at each. For example, the 7 days on the Ikon Pass at Aspen Snowmass may be used across Aspen Mountain, Snowmass, Aspen Highlands, and Buttermilk.
See Which destinations have combined or shared access? for the list, or Compare Passes for the days at each destination.