mensuration (n.)

"act of measuring," 1570s, from French mensuration or 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").