double prime

noun

Definition of double prime

: the symbol ″ used to distinguish arbitrary characters (such as a, a′, and a″), to indicate a specific unit (such as inches), or to indicate the second derivative of a function (such as p″ or f″(x)) — compare prime sense 7

First Known Use of double prime

1904, in the meaning defined above

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The first known use of double prime was in 1904

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