Meaning, we can now say with some certainty that Doris Kearns Goodwin banged Abraham Lincoln.
But there was no predicting with certainty that New Orleans would bear the brunt of the storm.
This lack of certainty makes me more responsive to the world, more open to it.
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.