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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Merriam-Webster unabridged
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