As defined with my former employer. Company specs may vary.
Minimum obstacle clearance altitude. (MOCA)
Is the sum of the maximum terrain or obstacle elevation whichever is highest plus 1000 feet for elevation up to and including 6000 feet or 2000 feet for elevation exceeding 6000 feet. MOCA in hundreds of feet is given in the RFC SID and STAR. The lowest MOCA to be indicated is 2000 feet. MOCA is valid for a corridor of variable width as indicated.