[ˈkwɔːtʌɪl], (Noun)

Definitions:
- each of four equal groups into which a population can be divided according to the distribution of values of a particular variable
(e.g: in the highest quartile, the mean age was 72)


Phrases:

Origin:
early 16th century (in the sense ‘quadrature’ (in astronomy)): from medieval Latin quartilis, from Latin quartus ‘fourth’. The senses relating to statistics date from the late 19th century