WordWeb Online

1. Fairly large
   "won by a substantial margin"
   - significant
    
2. Having a firm basis in reality and being therefore important, meaningful, or considerable
   "substantial equivalents"
   - substantive
    
3. Having substance or capable of being treated as fact; not imaginary
   "the substantial world"; "a mere dream, neither substantial nor practical"; "most ponderous and substantial things"
   - real, material
    
4. Providing abundant nourishment
   "ate a substantial breakfast"
   - hearty, satisfying, solid, square
    
5. Of good quality and condition; solidly built
   "several substantial timber buildings"
   - solid, strong

See also: considerable, essential, material, solidness, sound, substance, substantiality, substantially, substantialness, wholesome

Antonym: insubstantial

Encyclopedia: Substantial