Meaning of quintile

quin•tile

Pronunciation: (kwin'til, -tīl), [key]
— n.
  1. a quantile for the special case of five equal proportions.
  2. a quintile aspect.
—adj.
  1. of or pertaining to the aspect of two heavenly bodies that are one fifth of the zodiac, or 72°, apart.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.