the branch of applied mathematics that deals with the measurement of the shape and area of large tracts of country, the exact position of geographical points, and the curvature, shape, and dimensions of the earth.
Also, geodetics [jee-uh-det-iks] .

1560–70; < French géodésie < Greek geōdaisía, equivalent to geō- geo- + daí(ein) to divide + -sia, variant of -ia -ia (generalized from stems ending in t)

geodesist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
geodesy or geodetics (dʒɪˈɒdɪsɪ, ˌdʒiːəʊˈdɛtɪks)
the branch of science concerned with determining the exact position of geographical points and the shape and size of the earth
[C16: from French géodésie, from Greek geōdaisia, from geo- + daiein to divide]
geodetics or geodetics
[C16: from French géodésie, from Greek geōdaisia, from geo- + daiein to divide]
ge'odesist or geodetics

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
geodesy   (jē-ŏd'ĭ-sē)  Pronunciation Key 
The scientific study of the size and shape of the Earth, its field of gravity, and such varying phenomena as the motion of the magnetic poles and the tides.

geodetic adjective
The American Heritage® Science Dictionary
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