1
as in significant
having great meaning or lasting effect
substantial changes to the school dress code that made a lot of people unhappy
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2
as in large
of a size greater than average of its kind
the amount he inherited was quite substantial, so he quit his job and set out to see the world
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3
as in physical
relating to or composed of matter
the Land of Oz turned out to be a world of dreams, even less substantial than a rainbow
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4
as in considerable
sufficiently large in size, amount, or number to merit attention
there's been a substantial increase in attendance at girls' volleyball games ever since the start of their winning streak
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as in largeness
the quality or state of being large in size
their donation may not be impressive in its substantiality, but it did come from the heart, and that is what is really important
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Merriam-Webster unabridged
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