Relating to gromatics, the science of land measurement and surveying, or to the groma, an ancient Roman surveying instrument.
From Latin groma (a surveying cross-staff used by Roman engineers) plus -ical suffix. The Romans developed precise measurement techniques that influenced all later surveying.
The Roman groma was ancient GPS! Roman surveyors used this tool to build straight roads across the empire, and the word survived because the technique was so effective and copied for centuries.
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