substantial adj1 a : of or relating to substance
b : not illusory
: having merit [failed to raise a constitutional claim]
c : having importance or significance
: material [a step had not been taken toward commission of the crime "W. R. LaFave and A. W. Scott, Jr."]
2 : considerable in quantity
: significantly great [would be a abuse of the provisions of this chapter "U.S. Code "] compare de minimis
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.