known unknown

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English[edit]

English Wikipedia has an article on:
Wikipedia

Etymology[edit]

Popularized by Donald Rumsfeld in 2002, though used much earlier.

Noun[edit]

known unknown (plural known unknowns)

  1. An uncertainty of known magnitude, consequence, structure, and probability characteristics; something that we know that we don't know.

Related terms[edit]

Anagrams[edit]

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