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From The Collaborative International Dictionary of English v.0.48:
Substantial \Sub*stan"tial\, a. [F. substantiel, L. substantialis.] 1. Belonging to substance; actually existing; real; as, substantial life. --Milton. [1913 Webster] If this atheist would have his chance to be real and substantial agent, he is more stupid than the vulgar. --Bentley. [1913 Webster] 2. Not seeming or imaginary; not illusive; real; solid; true; veritable. [1913 Webster] If happinessbe a substantial good. --Denham. [1913 Webster] The substantial ornaments of virtue. --L'Estrange. [1913 Webster] 3. Corporeal; material; firm. "Most ponderous and substantial things." --Shak. [1913 Webster] The rainbow [appears to be] a large substantial arch. --I. Watts. [1913 Webster] 4. Having good substance; strong; stout; solid; firm; as, substantial cloth; a substantial fence or wall. [1913 Webster] 5. Possessed of goods or an estate; moderately wealthy; responsible; as, a substantial freeholder. "Substantial yeomen and burghers." --Sir W. Scott. [1913 Webster]