Circumvallation

//sɚkəmvæˈleɪʃən// noun

Definitions

Noun
  1. 1
    A rampart or other defensive entrenchment that entirely encircles the position being defended.

    "[...] and in a word, would intrench and fortify them round with as many circumvallations and breast-works, as my uncle Toby would a citadel."

Etymology

Borrowed from Latin circumvāllātiō. By surface analysis, circumvallate + -ation.

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