different between validity vs certainty

English

Etymology

valid +? -ity, borrowed from Middle French validité, from Late Latin validitas.

Noun

validity (countable and uncountable, plural validities)

1. The state of being valid, authentic or genuine.
2. State of having legal force.
3. A quality of a measurement indicating the degree to which the measure reflects the underlying construct, that is, whether it measures what it purports to measure (see reliability).

Translations

English

Etymology

From Middle English certeynte (“surety”), from Anglo-Norman certeinte, from Old French certeinete, from Vulgar Latin *cert?nit?s, from Latin certus.

Pronunciation

• (General American) IPA^(key): /?s?tn?ti/
• (Received Pronunciation) IPA^(key): /?s??tn?ti/
• Hyphenation: cer?tain?ty

Noun

certainty (countable and uncountable, plural certainties)

1. The state of being certain.

   Synonyms: certitude, sureness

   Antonyms: doubt, uncertainty

   • October 12, 1786, Fisher Ames, "Lucius Junius Brutus", in Independent Chronicle

     The certainty of punishment is the truest security against crimes.

2. An instance of being certain.
3. A fact or truth unquestionably established.

   Synonyms: see Thesaurus:sure thing

   • November 2 2014, Daniel Taylor, "Sergio Agüero strike wins derby for Manchester City against 10-man United," guardian.co.uk

     Yet the truth is that City would probably have been coasting by that point if the referee, Michael Oliver, had not turned down three separate penalties, at least two of which could be accurately described as certainties.

   • 1824, Walter Savage Landor, Imaginary Conversations Volume 1

     Certainties are uninteresting and sating.

Derived terms

• certainty equivalent
• of a certainty

Related terms

• certain

Translations

Further reading

• certainty on Wikipedia.Wikipedia