quartile
noun
- any of the values in a series dividing the distribution of the individuals in the series into four groups of equal frequency
- any of these groups
See quartile in American Heritage Dictionary 4
(kwôrˈtīlˌ, -tĭl)
noun The value of the boundary at the 25th, 50th, or 75th percentiles of a frequency distribution divided into four parts, each containing a quarter of the population.
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