Noun alluvion has 3 senses
- alluvion - gradual formation of new land, by recession of the sea or deposit of sediment
--1 is a kind of geological process, geologic process
- flood, inundation, deluge, alluvion - the rising of a body of water and its overflowing onto normally dry land; "plains fertilized by annual inundations"
--2 is a kind of geological phenomenon
--2 has particulars: debacle; flash flood, flashflood
- alluvial sediment, alluvial deposit, alluvium, alluvion - clay or silt or gravel carried by rushing streams and deposited where the stream slows down
--3 is a kind of sediment, deposit
--3 has substances: alluvial soil
--3 has particulars: placer
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