/kwin"til, -tuyl/ , n.
1. Statistics. a quantile for the special case of five equal proportions.
2. Astrol. a quintile aspect.
adj.
3. Astrol. of or pertaining to the aspect of two heavenly bodies that are one fifth of the zodiac, or 72°, apart.
[ 1600-10; quint ( us ) FIFTH + -ILE (as in quartile ) ]