'regionally-compared' originates from the combination of 'regionally' and 'compared', where 'regionally' refers to 'pertaining to a region' and 'compared' means 'examined in relation to something else'.

'Regionally' and 'compared' have been used separately in English since the 14th century, and their combination into 'regionally-compared' is a modern construct to describe comparative analysis across regions.

Initially, 'regionally' and 'compared' were used separately, but their combination has evolved to specifically denote comparative analysis across different regions.