error of closure
英[ˈerə ɔv ˈkləʊʒə]美[ˈɛrɚ ʌv ˈkloʒɚ]
1.
Nthe amount by which a computed, plotted, or observed quantity or position differs from the true or established one, esp when plotting a closed traverse 闭合差 (Also called closing error)[surveying]