WordWeb Online

1. Having a quality that thrusts itself into attention
   "a new theory is the most prominent feature of the book";
   - outstanding, salient, spectacular, striking
    
2. Conspicuous in position or importance
   "a prominent citizen";
   - big, large
    
3. Standing above others in quality or position
   "prominent members of the community";
   - eminent, high
    
4. Of imposing height; especially standing out above others
   "a prominent peak";
   - eminent, lofty, soaring, towering

See also: conspicuous, high, superior

Encyclopedia: Prominent