10 letters · 15 points in Scrabble
noun an abatement in intensity or degree (as in the manifestations of a disease)
noun a gradual sinking to a lower level
noun the sudden collapse of something into a hollow beneath it
originLatin subsidens, subsidentis, present participle of subsidere. Equivalent to subside + -ence.
Etymology from Wiktionary, CC BY-SA 3.0