[al.lu.vi.on] n [L alluvion-, alluvio, fr. alluere to flow past, deposit (of water), fr. ad- + lavere to wash--more at lye] (1536) 1: the wash or flow of water against a shore
2: flood, inundation
3: alluvium
4: 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