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The Collaborative International Dictionary
Countervallation

Countervallation \Coun`ter*val*la"tion\ (-v?l-l?"s??n), n. (Fort.) See Contravallation.

Wiktionary
countervallation

n. (archaic form of contravallation English)

Usage examples of "countervallation".

Those monsters can break down walls, if the Malwa start building lines of countervallation, which they will if he's managed to take the triangle.