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embankment (n.)

"a mound, bank, dike, or earthwork raised for any purpose," 1786, from embank "to enclose with a bank" (1570s; see em- (1) + bank (n.2)) + -ment.

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Definitions of embankment from WordNet

embankment (n.)
a long artificial mound of stone or earth; built to hold back water or to support a road or as protection;
From wordnet.princeton.edu