quin·tile (kwĭntīl′, kwĭntl)
1. The astrological aspect of planets distant from each other by 72° or one fifth of the zodiac.
a. Any of the groups that result when a frequency distribution is divided into five groups of equal size.
b. Any of the values that separate each of these groups.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.