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 of substantiate

• prove
• establish
• demonstrate

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

The findings of that report haven’t been publicized, but several of the allegations were substantiated, while others were not, according to Boggie’s lawsuit. —Alex Brizee, Idaho Statesman, 10 June 2026

Trump, without substantiating, claimed that the FBI actually ushered rioters inside the Capitol and that the individuals only pleaded guilty out of fear of getting harsher sentences. —Chad De Guzman, Time, 8 June 2026

Judge Nelson’s concerns are unfounded, as Kalshi and its confederates—Robinhood, Coinbase, and the CFTC—are not relying solely on the 2010 Dodd-Frank Act update to substantiate their claim that the CEA empowers the CFTC to regulate betting on the outcomes of sporting events. —Daniel Wallach, Forbes.com, 1 June 2026

While those allegations were never substantiated, Frey said investigators found that O'Hara had interfered with the probe. —ABC News, 27 May 2026

Word History

First Known Use

1610, in the meaning defined at sense 1

Rhymes for substantiate

• abdicate
• abrogate
• acetate
• activate
• actuate
• aggravate
• agitate
• alginate
• alienate
• allocate
• amputate
• angulate

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