WordWeb Online

1. Moderate to inferior in quality
   "they improved the quality from mediocre to above average";
   - second-rate
    
2. Lacking exceptional quality or ability
   "the calibre of the students has gone from mediocre to above average";
   - average, fair, middling
    
3. Poor to middling in quality
   "there have been good and mediocre and bad artists"

See also: bad, inferior, ordinary

Encyclopedia: Mediocre