1. (noun)alluvion gradual formation of new land, by recession of the sea or deposit of sediment Synonyms: alluvial sediment, flood, inundation, alluvial deposit, deluge, alluvium
3. (noun)alluvial sediment, alluvial deposit, alluvium, alluvion clay or silt or gravel carried by rushing streams and deposited where the stream slows down Synonyms: alluvial sediment, flood, inundation, alluvion, alluvial deposit, alluvium, deluge