1. Strictly, the flow or wash of water against a shore or riverbank.
2. An accumulation of soil, clay, or other material deposited by water; esp., in land law, an addition of land caused by the buildup of deposits from running water, the added land then belonging to the owner of the property to which it is added. — Also termed alluvium.
3. Louisiana law. An accumulation of soil, clay, or other material deposited on the bank of a river. • In Louisiana, lands formed on a seashore or the bank of a navigable lake are not alluvion. They belong to the state rather than the riparian owners. Cf. ACCRETION(1); AVULSION(2); DELICTION; EROSION. [Cases: Navigable Waters 44; Waters and Water Courses 93. C.J.S. Navigable Waters § 94; Waters §§ 177–182, 184–185.] — alluvial, adj. — allu-viate, vb. — alluviation, n.
