This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A rampart or other defensive entrenchment.

n. The act of surrounding with a wall or rampart.

n. 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.

n. In fortification, the art or act of throwing up fortifications about a place, either for defense or attack; the line of works so formed.

"'circumvallation' are dim, and high authorities like Dr. Macdonald are sceptical about them."

millstone    memory    immediate    portress    23-year-old    frequenting    whaleboat    suppliance