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The Collaborative International Dictionary
degressive

degressive \degressive\ adj.

  1. going down by steps.

  2. gradually decreasing in rate on sums below a certain amount. [WordNet 1.5] ||

Wiktionary
degressive

a. 1 Tending to decrease 2 Decreasing in steps

WordNet
degressive
  1. adj. going down by steps

  2. gradually decreasing in rate on sums below a certain amount