substantiate

verb

sub·​stan·​ti·​ate səb-ˈstan(t)-shē-ˌāt 

substantiated; substantiating

transitive verb

1

: to give substance or form to : embody

2

: to establish by proof or competent evidence : verify

substantiate a charge

substantiation

səb-ˌstan(t)-shē-ˈā-shən 

noun

substantiative

səb-ˈstan(t)-shē-ˌā-tiv 

adjective

Synonyms

• demonstrate
• establish
• prove
• show

Choose the Right Synonym for substantiate

confirm, corroborate, substantiate, verify, authenticate, validate mean to attest to the truth or validity of something.

confirm implies the removing of doubts by an authoritative statement or indisputable fact.

confirmed the reports

corroborate suggests the strengthening of what is already partly established.

witnesses corroborated his story

substantiate implies the offering of evidence that sustains the contention.

the claims have yet to be substantiated

verify implies the establishing of correspondence of actual facts or details with those proposed or guessed at.

all statements of fact in the article have been verified

authenticate implies establishing genuineness by adducing legal or official documents or expert opinion.

handwriting experts authenticated the diaries

validate implies establishing validity by authoritative affirmation or by factual proof.

validated the hypothesis by experiments

Examples of substantiate in a Sentence

substantiated his claim to local mountaineering fame with a photo of himself on the summit of Mount McKinley

Mr. MacGregor couldn't substantiate that it was Peter, and not some other rabbit, in the cabbage patch.

Recent Examples on the Web

However, nearly two weeks after Elsy Noemi Berrios, 52, was taken into Immigration and Customs Enforcement custody, DHS has yet to disclose any evidence to substantiate its claim against the Salvadoran woman to the public or, her attorneys say, to them. —Polo Sandoval, CNN Money, 12 Apr. 2025

As of yet, Allure has been unable to substantiate the coma claim (our source confirmed with three different people who have knowledge of the matter that a plastic surgeon's rib patient wound up in an ICU in Los Angeles). —Jolene Edgar, Allure, 10 Apr. 2025

Whether a defendant who produces credible evidence of such a final, unanimous, and unannounced acquittal is entitled to a post-trial hearing to substantiate the fact of such acquittal. —Michael Ruiz, FOXNews.com, 4 Apr. 2025

This particular thought process, constituted the existence of the Transatlantic slave trade which enslaved nearly 12.5 million Africans and ultimately substantiated the United State’s as one of the richest countries in the world. —Essence, 25 Mar. 2025

Word History

First Known Use

1610, in the meaning defined at sense 1

Rhymes for substantiate

• abbreviate
• accelerate
• accommodate
• accumulate
• acuminate
• adjudicate
• adulterate
• affiliate
• agglomerate
• agglutinate
• alleviate
• amalgamate

Kids Definition

substantiate

verb

sub·​stan·​ti·​ate səb-ˈstan-chē-ˌāt 

substantiated; substantiating

1

: to give substance or form to : embody

2

: to establish by proof or evidence

substantiate a claim

substantiation

-ˌstan-chē-ˈā-shən 

noun