From WordNet (r) 3.0 (2006):
substantial
adj 1: fairly large; "won by a substantial margin" [syn:
significant, substantial]
2: having a firm basis in reality and being therefore important,
meaningful, or considerable; "substantial equivalents" [syn:
substantial, 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"- Shakespeare [syn: substantial, real, material]
[ant: insubstantial, unreal, unsubstantial]
4: providing abundant nourishment; "a hearty meal"; "good solid
food"; "ate a substantial breakfast"; "four square meals a
day" [syn: hearty, satisfying, solid, square,
substantial]
5: of good quality and condition; solidly built; "a solid
foundation"; "several substantial timber buildings" [syn:
solid, strong, substantial]