stanine
noun
sta·nine
| \ ˈstā-ˌnīn
\
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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
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