degression
noun
de·gres·sion
dēˈgreshən
plural -s
1
: a stepping or movement downward : descent —used chiefly as a correlative of progression
2
: the decrease in rate in degressive taxation
Word History
Etymology
Middle English degressioun, from Medieval Latin degression-, degressio, from Latin degressus (past participle of degredi to go down, from de- + -gredi) to go, step + -ion-, -io -ion