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
Origin and Etymology of stanine
standard (score) + nine
First Known Use: 1944
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