from The Century Dictionary and Cyclopedia
- n. The custom of dividing land into centuries. See century, 2 .
Sorry, no etymologies found.
But the 'centuriation' still visible in north Italy around colonies planted about 180 B.C. is no full proof of rectangular surveying at that date.
The surveyors, in particular, are much more concerned with the soil of the province and its 'limitation' and 'centuriation', than with the arrangements of any individual town, and, whatever their value for extramural boundaries,  throw no light on streets and 'insulae'.