WordWeb Online

1. Characterized by grandeur
   "magnificent cathedrals"
   - brilliant, glorious, splendid
    
2. Surpassingly good
   - superb
    
3. Of surpassing excellence
   - brilliant, superb
    
4. Extraordinarily good or great; used especially as an intensifier
   - fantastic, grand, howling, marvelous [US], marvellous [Brit, Cdn], rattling, terrific, tremendous, wonderful, wondrous

See also: extraordinary, good, impressive, magnificence, magnificently, superior

Encyclopedia: Magnificent