autocorrelation

noun
au·to·cor·re·la·tion | \ˌȯ-tō-ˌkȯr-ə-ˈlā-shən, -ˌkär-\

Definition of autocorrelation 

: the correlation between paired values of a function of a mathematical or statistical variable taken at usually constant intervals that indicates the degree of periodicity of the function

First Known Use of autocorrelation

1933, in the meaning defined above

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The first known use of autocorrelation was in 1933

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