Known Known Definition
    noun
  
 Certainties of known magnitude, consequence, structure, and probability characteristics; something that we know that we know.
 Wiktionary 
Other Word Forms of Known Known
Noun
Singular:
 known knownPlural:
 known knownsOrigin of Known Known
Popularized by Donald Rumsfeld in 2002, though used much earlier.
From Wiktionary
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