/kwawr"tuyl, -til/ , n.
1. 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. Cf. first quartile, median, third quartile .
2. Astrol. a quartile aspect.
adj.
3. Astrol. of or pertaining to the aspect of two heavenly bodies when their longitudes differ by 90°.
[ 1500-10; quartilis, equiv. to L quart ( us ) FOURTH + -ilis -ILE ]