substantially
Americanadverb
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by an ample or considerable amount; quite a lot.
As a professor, my workload is substantially reduced or eliminated during the summer months.
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in a basic or essential way; fundamentally.
The new law mandates equal pay for substantially similar work, whether at the same establishment or not.
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in a solid or firm way; stoutly or sturdily.
In the far north, homes take more fuel to heat and also have to be built more substantially.
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in a corporeal or material way; physically.
The Eucharist makes the very Person of Christ truly, really, and substantially present in the consecrated bread and wine.
Other Word Forms
Etymology
Origin of substantially
Explanation
Substantially means "to a great extent." Your college fund was substantially increased by your grandfather's generous gift. What the heck, I'll throw in a quarter, too. Substantially is a good word to know any time you want to establish something's extent. It basically suggests "a large part." Your raise made your life substantially easier. The word also suggests an essential nature, as in "Nothing was substantially changed by the new law." The word carries a great deal of weight, as can be seen in this quote by Albert Einstein: "We shall require a substantially new manner of thinking if mankind is to survive."
Vocabulary lists containing substantially
John F. Kennedy's Address to the American People on the Cuban Missile Crisis (1962)
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Lee Surrenders to Grant (1865)
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Most Dangerous
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The commitments include approximately $447.5 billion expected to be incurred before the end of 2030; substantially all the rest is likely to hit between 2031 and 2045.
From The Wall Street Journal ● Nov. 2, 2026
Coatsworth added that "travellers should brace themselves for a sharp increase in the cost of flying unless oil prices fall substantially".
From Barron's ● Nov. 2, 2026
Businesses also boosted inventories substantially to replace depleted warehouses and to keep up with rising customer demand.
From MarketWatch ● Oct. 29, 2026
By directing powerful ultraviolet lasers at helium atoms, researchers produced X-rays with substantially higher energies than the standard model predicts.
From Science Daily ● Oct. 29, 2026
These students performed substantially better than they did in their old academic settings and graduated at a much higher rate than their past performance would have predicted.
From "Freakonomics: A Rogue Economist Explores the Hidden Side of Everything" by Steven D. Levitt
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Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
