noun, feminine/i.nɔ̃.da.sjɔ̃/plural: inondations
inondation is feminine in French.
flood (overflow of water); flood, inundation (a large influx of e.g. people)
“Les inondations ont causé d'importants dégâts dans la région.” — The floods have caused significant damage in the region.
From Old French inundacion, from Latin inundātiōnem.