1. an abatement in intensity or degree (as in the manifestations of a disease); "his cancer is in remission"
(synonym) remission, remittal
(hypernym) suspension, respite, reprieve, hiatus, abatement
(derivation) subside, lessen
2. a gradual sinking to a lower level
(synonym) settling, subsiding
3. the sudden collapse of something into a hollow beneath it
(synonym) cave in