sub·​stan·​ti·​ate səb-ˈstan(t)-shē-ˌāt How to pronounce substantiate (audio)
substantiated; substantiating

transitive verb

: to give substance or form to : embody
: to establish by proof or competent evidence : verify
substantiate a charge
substantiation noun
substantiative adjective
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, according to a letter from Interim DPW Director Richard Luna to Cumming, DPW’s human resources conducted an investigation and substantiated all claims outlined in the investigation report, although neither the synopsis nor Luna’s response specifies the extent of disciplinary action. Dillon Mullan, Baltimore Sun, 15 Feb. 2024 Roman's filing, which offered no proof to substantiate the sensational claims, called for the prosecutors to be disqualified and for the charges against him to be dismissed. Amy Gardnerand Holly Bailey The Washington Post,, 13 Feb. 2024 So far, Republicans have yet to produce concrete evidence that substantiates any of these allegations. Reese Gorman, Washington Examiner, 2 Jan. 2024 Researchers raised eyebrows early in the year with claims of operational room-temperature superconductors, though none has been substantiated, and one paper from researchers at the University of Rochester was retracted by the journal Nature at the authors’ request in November. Mary Magnuson, Discover Magazine, 7 Dec. 2023 In a war where even the most basic statistics, such as deaths and injuries, are subject to skepticism—Hamas runs the Gaza Health Ministry, which keeps track of such numbers—every report is, ideally, independently substantiated. Clare Malone, The New Yorker, 13 Jan. 2024 Former House Speaker Kevin McCarthy confirmed in February that the House Ethics Committee was investigating Santos after a sprawling New York Times report found that a large portion of his biography could not be substantiated. Virginia Chamlee, Peoplemag, 15 Nov. 2023 Neither Burdick, Lasting Change CEO Smith nor Terrell disclosed during their testimony to lawmakers that the abuse claim that was central to that lawsuit had been ruled to be substantiated by DCS. Tony Cook, ProPublica, 28 Nov. 2023 But none came from official archaeological excavations, and none had substantiated backstories. Discover Magazine, 4 Dec. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'substantiate.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1610, in the meaning defined at sense 1

Time Traveler
The first known use of substantiate was in 1610

Dictionary Entries Near substantiate

Cite this Entry

“Substantiate.” Dictionary, Merriam-Webster, Accessed 27 Feb. 2024.

Kids Definition


sub·​stan·​ti·​ate səb-ˈstan-chē-ˌāt How to pronounce substantiate (audio)
substantiated; substantiating
: to give substance or form to : embody
: to establish by proof or evidence
substantiate a claim
substantiation noun

More from Merriam-Webster on substantiate

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