mensurability

_ Now mensurability implies the existence of actual, definite limits, since without them there could be no fixed relation between the given object and the standard of measurement, and, consequently, no possibility of exact mensuration.

Christianity and Greek Philosophy or, the relation between spontaneous and reflective thought in Greece and the positive teaching of Christ and His Apostles 1852

Its mensurability indeed ought to be its most unquestionable quality; but this imagined standard has proved virtually unmeasurable -- in so far at least that its twenty-six different and skilled measurers all differ from each other in respect to its dimensions.

Archaeological Essays, Vol. 1 James Young Simpson 1840