stanine

noun
sta·​nine | \ˈstā-ˌnīn \

Definition of stanine 

: any of the nine classes into which a set of normalized standard scores arranged according to rank in educational testing are divided, which include the bottom 4 percent and the top 4 percent of the scores in the first and ninth classes and the middle 20 percent in the fifth, and which have a standard deviation of 2 and a mean of 5

First Known Use of stanine

1944, in the meaning defined above

History and Etymology for stanine

standard (score) + nine

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The first known use of stanine was in 1944

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