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.
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.
(statistics) Any one of the four groups so divided.
This school is ranked in the first quartile.
Origin of quartile
- Middle English 90 degrees apart (of the relative position of two celestial bodies) from Old French quartil from Medieval Latin quārtīlis of a quartile from Latin quārtus fourth quart
From American Heritage Dictionary of the English Language, 5th Edition