The process or result of marking something with a graticule; the pattern of grid lines on a map or scientific instrument.
From 'graticulate' plus the noun suffix '-ion.' This technical term developed in cartography and later scientific fields.
A map's graticulation (the grid of latitude and longitude lines) is so fundamental we barely notice it, but it was a revolutionary breakthrough—it meant explorers could record exact locations and share maps that actually matched reality across vast distances.
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