What is "reliction"

Reliction \Re*lic"tion\ (r?-l?k"sh?n), n. [L. relictio a leaving behind.] (Law) A leaving dry; a recession of the sea or other water, leaving dry land; land left uncovered by such recession.
--Burrill.

in law, "a recession of the sea from the land," 1670s, from Latin relictionem (nominative relictio), noun of action from past participle stem of relinquere (see relinquish).

n. the gradual loss of water from a river, lake etc to leave permanent dry land