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English word substantial comes from Old French substantiel
substantiel (Old French)
substantial (English)
Ample or full.. Corporeal; material; firm.. Having a substance; actually existing.. Having good substance; strong; stout; solid; firm.. Large in size, quantity, or value; vast.. Most important; essential.. Not imaginary; real; actual; true; veritable.. Significantly great.. Possessed of goods or an estate; moderately wealthy; responsible. Anything having substance; an essential part.