measure in Greek

(mathematics, measure theory) A function which obeys a particular set of formal conditions, created to generalize and rigorize the notions of length, volume, and probability. Formally, a non-negative, countably additive set function on a sigma-algebra; see w:Measure (mathematics) on Wikipedia.Wikipedia [from 20th c.]

To ascertain the quantity of a unit of material via calculated comparison with respect to a standard.