Breaking down of scores into blocks each representing 25 percent of total scores. For example, the lowest 25 %, the next 26 to 50 % and so on.

QUARTILE: "John's scores were consistently in the second quartile."
Cite this page: N., Pam M.S., "QUARTILE," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/quartile/ (accessed October 19, 2019).