Definition of circumvallation in English:

circumvallation

Line breaks: cir¦cum|val¦la¦tion
Pronunciation: /səːkəmvaˈleɪʃ(ə)n
 
/

noun

A defensive wall of a castle or walled city: a small stream encircled the space between the inner and outer circumvallations
More example sentences
  • This circumvallation had begun modestly enough as a yard-high rampart with stockade and ditch, but successive developments raised it to well over 30 feet.
  • Edinburgh had been walled in 1450, and so narrow was the circumvallation that the Cowgate was beyond the circle of towers.
  • The Athenians cut off Syracuse with two forts, and began a twin circumvallation, but left their northern walls incomplete, which proved disastrous.

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