-dəsē, -si noun
( -es )
Etymology: Greek geōdaisia, from geō- ge- + daisia (from dais-, stem of daiesthai to divide + -ia -y) — more at tide
1. : a branch of applied mathematics that determines by observation and measurement the exact positions of points and the figures and areas of large portions of the earth's surface, the shape and size of the earth, and the variations of terrestrial gravity and magnetism
2. : geodetic surveying