degression

noun3

1. •
   Degressive taxation, a system of progressive decreases in a rate of taxation (as tariffs etc.) below certain benchmarks.

   • Graduated taxation therefore technically includes progression, degression, and regression. — 1896
2. •
   Degressive description, a system of varying descriptions of a book in accordance to its importance or available space.
3. •
   (no longer used) Descent, the act of descending.