Dictionary:

quartile

  (kwôr'tīl', -tĭl)

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.

[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. See quart.]

A statistical term describing a division of observations into four defined intervals based upon the values of the data and how they compare to the entire set of observations.

Investopedia Says:
Each quartile contains 25% of the total observations. Generally, the data is ordered from smallest to largest with those observations falling below 25% of all the data analyzed allocated within the 1st quartile, observations falling between 25.1% and 50% and allocated in the 2nd quartile, then the observations falling between 51% and 75% allocated in the 3rd quartile, and finally the remaining observations allocated in the 4th quartile.

Try not to confuse a quarter with a quartile.

Statistical measurement. The first quartile of a list is the number that has three quarters of the numbers in the list below it; the fourth quartile is the number that has three quarters of the numbers above it; the second quartile is the same as the median.

statistics A form of quantile; divides the range into quarters.

One of the values establishing the division of a series of variables into fourths, or the range of items included in such a segment.

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