Regional

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Middle English: from Old French, from Latin regio(n- ) ‘direction, district’, from regere ‘to rule, direct’.

wiktionary

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From Middle French régional, from Latin regiōnālis.

etymonline

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regional (adj.)

"of or peculiar to a (particular) place or country," early 15c., regionale, from Late Latin regionalis "of or belonging to a region or province," from stem of regio (see region). Related: Regionally.