for a fact

adverb

Without doubt.

“I know this for a fact.”

Similar
for a certainty
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Meanings

adverbfor a fact (not comparable)
  1. idiomaticnot comparableWithout doubt.

    I know this for a fact.

    Synonyms: for a certainty

  2. not comparableUsed other than figuratively or idiomatically: see for, a, fact.

    The doctor had asked for a fact that I could not remember.

Synonyms & antonyms

adverbWithout doubt.

Similar
for a certainty
Also see
certainlyfor certainpositively

Translations

Spanish de buena tinta, a ciencia cierta
  • de buena tintaTranslations
  • a ciencia ciertaTranslations
  • de ciencia ciertaTranslations
  • con certezaTranslations
  • con certidumbreTranslations
  • con certitudTranslations
Cite this entry
APA

for a fact. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/for%20a%20fact

MLA

“for a fact.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/for%20a%20fact. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “for a fact,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/for%20a%20fact.

Source: for a fact on Wiktionary, CC BY-SA 4.0.