certainty


noun, plural cer·tain·ties.

  1. the state of being certain.
  2. something certain; an assured fact.
Idioms

  1. for/of a certainty, certainly; without a doubt: I suspect it, but I don’t know it for a certainty.

noun plural -ties

  1. the condition of being certain
  2. something established as certain or inevitable
  3. for a certainty without doubt
n.

c.1300, certeynte, “surety, pledge,” from Anglo-French certeinté (late 13c.), Old French certainete “certainty,” from Latin or Vulgar Latin *certanitatem (source of Old Spanish certanedad); see certain. Meaning “that which is certain” is attested from early 14c.; meaning “quality of being certain” is from mid-14c.

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