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contravallation

[kon-truh-vuh-ley-shuh n] /ˌkɒn trə vəˈleɪ ʃən/
noun, Fortification
1.
a more or less continuous chain of redoubts and breastworks raised by besiegers outside the line of circumvallation of a besieged place to protect the besiegers from attacks from the outside, as by a relieving force.
Origin
1670-1680
1670-80; contra-1 + vallation; compare French contrevallation, Italian contravvallazione
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for contravallation

contravallation

/ˌkɒntrəvəˈleɪʃən/
noun
1.
fortifications built by besiegers around the place besieged
Word Origin
C17: from contra- + Latin vallātiō entrenchment; compare French contrevallation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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