mensuration
Concise Oxford English Dictionary © 2008 Oxford University Press:
mensuration/mɛnʃəˈreɪʃ(ə)n/
▶noun measurement.
■ the part of geometry concerned with ascertaining lengths, areas, and volumes.
– origin C16: from late L. mensuratio(n-), from mensurare ‘to measure’.
'mensuration' also found in these Oxford entries:

