Statistics. (in a frequency distribution) one of the values of a variable that divides the distribution of the variable into four groups having equal frequencies.Compare first quartile, median, third quartile.

Astrology. a quartile aspect.

adjective

Astrology. of or relating to the aspect of two heavenly bodies when their longitudes differ by 90°.

Origin of quartile

1500–10; < Medieval Latinquartīlis, equivalent to Latinquart(us) fourth + -īlis-ile

c.1500, originally in astronomy; see quartile (adj.). In statistics, from 1879.

adj.

mid-15c., "90 degrees apart" (of astronomical measurements), from Middle French quartil, from Medieval Latin quartilus "of a quartile," from Latin quartus "fourth" (see quart).