late 15c., from Latin degressionem (nominative degressio) "a going down," noun of action from past participle stem of degredi "to go down, march down, descend," from de- "down" (see de-) + gradus "step" (see grade (n.)).
1. To observe mosquito larva density degression rate , both hydrophytes and fishes death rate.
2. Landscape fragmentation is one of the major reasons drastic degression loss of biodiversity over the world.
3. PD's clinical characters are thrillingness, muscle rigidity , bradykinesia and the degression of independence ability.