Home › Words › S › subsidationsubsidationsubsidation means subsidence; sinking to a lower level as from geological activity.Among words judged in Lexicurio's Arena, subsidation ranks #2,613 of 42,762 for Qualifying.EtymologyFrom subside + -ation.nounsubsidence; sinking to a lower level as from geological activityDefinitions & examples from Wiktionary (CC BY-SA 3.0).