circumvallation noun.
[sǝ:kǝmva'leɪʃ(ǝ)n] M17.[Late Latin circumvallatio(n-), formed as CIRCUMVALLATE verb: see -ATION.]1. The making of a rampart or entrenchment.
M17.2. A rampart, an entrenchment;
fig. a surrounding defence.
M17. [TahlilGaran] English Dictionary ▲