1) Typically grouped by state, mountain peaks that range from 13,000 to 13,999 feet in height.

2) Slang for a hiker that climbs to the peak of mountains that range from 13,000 to 13,999 feet in height.
That state as over 657 13'ers.
He's a 13'er trying to climb all the 13,000 plus mountains in the state.
by Viking Barbarian December 27, 2019
Get the 13'er mug.