in·un·da·tion
ˌi(ˌ)nənˈdāshən
plural -s
1
: a rising and spreading of water over land not usually submerged : flood
the threat of inundation by the sea—
Lewis Mumford
his tears were not drops but a little inundation down his cheeks—
Glenway Wescott
fossil shells give evidence of prehistoric inundations
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Merriam-Webster unabridged



