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vallation

val·la·tion [ va láysh'n ] (plural val·la·tions)


noun 
Definition:
 
1. defensive earthwork: a defensive fortification or embankment made of earth

2. construction of defensive earthworks: the planning or building of defensive fortifications or embankments made of earth

[Mid-17th century. < Latin vallation-< vallare "protect" < vallumsee vallum]
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