al·​lu·​vi·​on ə-ˈlü-vē-ən How to pronounce alluvion (audio)
: the wash or flow of water against a shore
: an accession to land by the gradual addition of matter (as by deposit of alluvium) that then belongs to the owner of the land to which it is added
also : the land so added

Examples of alluvion in a Sentence

the nonstop torrential rains were threatening to produce an alluvion of biblical proportions

Word History


Latin alluvion-, alluvio, from alluere to flow past, deposit (of water), from ad- + lavere to wash — more at lye

First Known Use

circa 1541, in the meaning defined at sense 1

Time Traveler
The first known use of alluvion was circa 1541

Dictionary Entries Near alluvion

Cite this Entry

“Alluvion.” Dictionary, Merriam-Webster, Accessed 22 Apr. 2024.

Legal Definition


al·​lu·​vi·​on ə-ˈlü-vē-ən How to pronounce alluvion (audio)
: material (as clay, silt, sand, or gravel) deposited by running water
especially : the land added by the gradual or imperceptible accumulation of such material along a bank or shore
alluvion formed in front of the property of several owners is divided equitably Louisiana Civil Code
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