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Webster 1828 Edition

Noun.

The measuring of dimensions by a rule, as of a ship, cask, and the like.

The measure of a thing, or dimensions ascertained.

In these uses the word is equivalent to measurement, mensuration and measure.

The adjustment of proportion, or ascertainment of shares, as of dower or pasture held in common. This is done by

writ of admeasurement, directed to the sheriff.

admeasurement ‎(plural admeasurements)

Apportionment.
- 1781, Thomas Jefferson, Notes on the State of Virginia, Query I
  By admeasurements through nearly the whole of this last line, and supplying the unmeasured parts from good data, the Atlantic and Mississipi are found in this latitude to be 758 miles distant, equal to 13° 38′ of longitude, reckoning 55 miles and 3144 feet to the degree.