Of or relating to boundaries or limits defined by natural features like rivers or arches in Roman land surveying.
From Latin 'arcifinium' (a boundary naturally defined by geographical features), derived from 'arcus' (arch/boundary) + 'finis' (boundary); used in Roman legal and surveying terminology.
Ancient Roman surveyors used this term to distinguish between carefully measured property lines and boundaries that just followed natural features like a river's curve—basically the difference between GPS precision and 'just follow the creek.'
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