CIRCUMVALLATION

circumvallation. Circumvallation, n. a surrounding with walls or trenches boarded with breastwork, a trench

---

Cir′cum‐val‐la″tion (?), n. (Mil.) (a) The act of surrounding with a wall or rampart. (b) A line of field works made around a besieged place and the besieging army, to protect the camp of the besiegers against the attack of an enemy from without.