Obs. [n. of action f. prec.: see -ATION.] The action of filling up with earth; the washing up of alluvial soil.
1686. Plot, Staffordsh., 113. All valleys rise by atterration, i. e. by Earth continually brought down from the tops of Mountains by Rains and Snows.
1713. Derham, Phys.-Theol., 53. No accidental Currents and Atterrations of the Waters themselves … could ever have made or found so long and commodious Declivities and Channels.
1757. Da Costa, in Phil. Trans., L. 235. Producible by local deluges, atterrations, &c.
