Word definition: substantial

Defiintion of substantial:

[adj] fairly large; "won by a substantial margin"
[adj] 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
[adj] being the essence or essential element of a thing; "substantial equivalents"; "substantive information"
[adj] providing abundant nourishment; "a hearty meal"; "good solid food"; "ate a substantial breakfast"
[adj] of good quality and condition; solidly built; "a solid foundation"; "several substantial timber buildings"

Synonyms of substantial:

considerable, essential, hearty, in essence, material, real, satisfying, significant, solid, sound, strong, substantive, wholesome

Antonyms of substantial:

insubstantial, unreal, unsubstantial

See Also:

Webster Dictionary (1913) for substantial:

\Sub*stan"tial\, a. [F. substantiel, L.
1. Belonging to substance; actually existing; real; as,
   substantial life. --Milton.

         If this atheist would have his chance to be real and
         substantial agent, he is more stupid than the
         vulgar.                               --Bentley.

2. Not seeming or imaginary; not illusive; real; solid; true;

         If happinessbe a substantial good.    --Denham.

         The substantial ornaments of virtue.  --L'Estrange.

3. Corporeal; material; firm. ``Most ponderous and
   substantial things.'' --Shak.

         The rainbow [appears to be] a large substantial
         arch.                                 --I. Watts.

4. Having good substance; strong; stout; solid; firm; as,
   substantial cloth; a substantial fence or wall.

5. Possessed of goods or an estate; moderately wealthy;
   responsible; as, a substantial freeholder. ``Substantial
   yeomen and burghers.'' --Sir W. Scott.