alluvion

[uh-loo-vee-uhn]
noun
1.
Law. a gradual increase of land on a shore or a river bank by the action of water, whether from natural or artificial causes.
2.
overflow; flood.
3.
Now Rare. alluvium.

Origin:
1530–40; < Latin alluviōn- (stem of alluviō an overflowing), equivalent to al- al- + -luv-, base of -luere, combining form of lavere to wash) + -iōn- -ion

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World English Dictionary
alluvion (əˈluːvɪən)
 
n
1.  a.  the wash of the sea or of a river
 b.  an overflow or flood
 c.  matter deposited as sediment; alluvium
2.  law the gradual formation of new land, as by the recession of the sea or deposit of sediment on a riverbed
 
[C16: from Latin alluviō an overflowing, from luere to wash]

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Example sentences
In common practice the terms alluvion and accretion have been used almost interchangeably.
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