dereliction—The gaining of land from the water, in consequence of the sea shrinking back below the usual water mark; the opposite of alluvion.  Also, land left dry by running water retiring imperceptibly from one of its shores and encroaching on the other.  The voluntary abandonment of goods by the owner, without the hope or the purpose of returning to the possession.  “Dereliction” or “renunciation” of property at sea as well as on land requires both the intention to abandon and external action.  See also reliction; accretion; recession of water.

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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