"subsidence" in the noun sense
1. remission, remittal, subsidence
an abatement in intensity or degree (as in the manifestations of a disease
"his cancer is in remission"
2. settling, subsiding, subsidence
a gradual sinking to a lower level
3. cave in, subsidence
the sudden collapse of something into a hollow beneath it
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License