quintile

plural quintiles

1. mathematicsAny of the quantiles which divide an ordered sample population into five equally numerous subsets.
2. broadlyA subset thus obtained.

   Effectively no household making less than $28,000 will pay federal income tax – usually about 15% of the bottom income quintile has some tax liability.

   2021 August 19, Tami Luhby, “Far fewer Americans owed federal income tax in 2020 because of the pandemic”, in CNN, archived from the original on 08 Nov 2022

   1 more example

   “It’s well known that the lowest income consumer is really struggling with inflation, but from a purely economic standpoint, it is the higher quintiles of earners that do the most spending,” Nanette Abuhoff Jacobson, global investment strategist at Hartford Funds, told CNN.

   2024 May 19, Bryan Mena, “Wealthy Americans are starting to spend more carefully”, in CNN Business, archived from the original on 15 Jul 2024

3. astrologyAn aspect of planets that are distant from each other by one fifth of a zodiac (72°)

1. alternativehistoricalobsoleteAlternative form of Quintilis: the former Roman name of the month July.