mensuration (n.) Look up mensuration at Dictionary.com
"act of measuring," 1570s, from Middle French mensuration and directly from Late Latin mensurationem (nominative mensuratio) "a measuring," noun of action from past participle stem of mensurare "to measure," from Latin mensura "a measuring, a measurement; thing to measure by," from mensus, past participle of metiri "to measure," from PIE root *me- (2) "to measure."