Clay or slit or gravel carried by rushing streams and deposited where the stream slows down

• The rising of a body of water and its overflowing onto normally dry land
• Gradual formation of new land, by recession of the sea or deposit of sediment

Wikipedia Word definitions in Wikipedia
Alluvion is a legal term describing the increase in the area of land due to sediment ( alluvium ) deposited by a river. This changes the size of a piece of land (a process called accession ) and thus its value over time.

Wiktionary Word definitions in Wiktionary
n. (context legal English) The increase in the area of land due to the deposition of sediment (alluvium) by a river.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Alluvion \Al*lu"vi*on\, n. [F. alluvion, L. alluvio, fr. alluere to wash against; ad + luere, equiv. to lavare, to wash. See Lave .] Wash or flow of water against the shore or bank. An overflowing; an inundation; a flood. --Lyell. Matter deposited by an ...

WordNet Word definitions in WordNet
n. gradual formation of new land, by recession of the sea or deposit of sediment the rising of a body of water and its overflowing onto normally dry land; "plains fertilized by annual inundations" [syn: flood , inundation , deluge ] clay or silt or gravel ...