substantial

1 of 2

adjective

sub·​stan·​tial səb-ˈstan(t)-shəl 

1

a

: consisting of or relating to substance

b

: not imaginary or illusory : real, true

c

: important, essential

2

: ample to satisfy and nourish : full

a substantial meal

3

a

: possessed of means : well-to-do

b

: considerable in quantity : significantly great

earned a substantial wage

4

: firmly constructed : sturdy

a substantial house

5

: being largely but not wholly that which is specified

a substantial lie

substantial noun

substantiality

səb-ˌstan(t)-shē-ˈa-lə-tē 

noun

substantially

səb-ˈstan(t)-sh(ə-)lē 

adverb

substantialness

səb-ˈstan(t)-shəl-nəs 

noun

substantialness

2 of 2

noun

sub·​stan·​tial·​ness -chəlnə̇s 

plural -es

: substantiality

Synonyms of substantial

Adjective

• significant
• major
• important
• historic
• big

Examples of substantial in a Sentence

Adjective

A substantial number of people commute to work each day.

Activities like that pose a substantial risk of injury.

She purchased her tickets at a substantial discount.

Only the buildings that were constructed of more substantial materials survived the earthquake.

I was hoping that they would serve us something more substantial than wine and cheese.

Recent Examples on the Web

Adjective

That range gives a launcher positioned on Yonaguni the ability to threaten ships operating across a substantial area around the island and toward Taiwan. — Bojan Stojkovski, Interesting Engineering, 4 Oct. 2026

The Forest Service also has a substantial backlog of deferred road maintenance, with the agency estimating that cost at more than $9 billion. — Christiana Freitag, Chicago Tribune, 4 Oct. 2026

Meanwhile, the Associated Press reported that Republicans had substantial campaign funds to deploy and that the result could depend on whether Democrats turn out their voters. — Los Angeles Times, 4 Oct. 2026

In the wake of a depressing 69-93 season that sputtered out from the get-go, as so many a Royals campaign does, the club promptly made some substantial changes. — Kansas City Star, 4 Oct. 2026

Word History

First Known Use

Adjective

14th century, in the meaning defined at sense 2

Rhymes for substantial

• circumstantial
• insubstantial
• unsubstantial

Kids Definition

substantial

adjective

sub·​stan·​tial səb-ˈstan-chəl 

1

a

: consisting of or relating to substance : material

b

: not imaginary : real

the substantial world

c

: important sense 1, essential

substantial differences

2

: enough to satisfy and nourish

a substantial meal

3

a

: prosperous sense 1

a substantial farmer

b

: considerable in quantity : significantly large

a substantial increase

4

: firmly constructed

a substantial building

substantiality

-ˌstan-chē-ˈal-ət-ē 

noun

substantially

-ˈstanch-(ə-)lē 

adverb

Legal Definition

substantial

adjective

sub·​stan·​tial səb-ˈstan-chəl 

1

a

: of or relating to substance

b

: not illusory : having merit

failed to raise a substantial constitutional claim

c

: having importance or significance : material

a substantial step had not been taken toward commission of the crime

—W. R. LaFave and A. W. Scott, Jr.

2

: considerable in quantity : significantly great

identification of serious and substantial failure to perform

—U.S. Code

compare de minimis

substantiality

-ˌstan-chē-ˈa-lə-tē 

noun

substantially adverb