What does corroborate mean?
To corroborate something is to strengthen it with additional, usually independent, evidence — confirming that a statement, account, or finding is true or accurate. The verb is a fixture of formal English, appearing constantly in courtrooms, newsrooms, laboratories, and academic writing, wherever claims must be verified rather than simply asserted. A detective seeks testimony that corroborates a suspect's alibi; a scientist welcomes experiments that corroborate earlier results. What distinguishes corroboration from mere agreement is independence: two people repeating the same rumor do not corroborate each other, whereas two witnesses who observed events separately can. The word derives from the Latin corroborare, "to strengthen," built on robustus, the same root behind "robust" — so corroboration literally makes an assertion sturdier. Its noun form is corroboration, and its adjective is corroborative. For anyone who wants to write with precision about proof, verification, and evidence, corroborate is an indispensable term.
verbTo confirm or support (a statement, theory, or finding) with additional evidence or authority; to make more certain.
- To strengthen or support an account, statement, or conclusion with additional evidence, especially independent evidence.
"The witness's account was corroborated by security footage from the night in question."
"Two independent lab results corroborated the researchers' initial findings."
"Her testimony corroborates everything we suspected about the timeline of events."
"Corroborate" comes from the Latin robustus — the same root that gives us "robust" — so every time you corroborate a story, you're literally making it sturdier.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of corroborate
Corroborate comes from the Latin corroborare, meaning "to strengthen," formed from com- (an intensifying prefix) and robustus ("strong, sturdy"), the root that also gives English "robust." The word entered English in the late Middle Ages via Latin usage, and by the early modern period had settled into its modern sense of strengthening a statement with supporting evidence. Cognates sharing the robustus root include robust itself and related forms such as corroboration.
Related word forms
How corroborate is actually used
Corroborate is a formal word, most at home in legal, journalistic, academic, and scientific contexts, where it signals that separate sources agree. It typically takes the statement or account as its object ("the evidence corroborated her account") and often appears with "independently" to stress that confirmation came from a separate source. It carries no negative connotation; if anything, it implies rigor and reliability.
Easily confused with corroborate
To cooperate is to work together with others toward a shared goal, while to corroborate is to provide supporting evidence for a claim.