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Meaning of focal area

fo'cal ar"ea

Pronunciation: [key]
— Ling. Ling.
  1. (in dialect geography) an area whose dialect has exerted influence on the dialects of surrounding areas, as reflected in a set of isoglosses more or less concentrically surrounding it. Cf. relic area, transition area.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.