Focal-area
noun, Linguistics.
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.
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- Focalize
[foh-kuh-lahyz] /ˈfoʊ kəˌlaɪz/ verb (used with or without object), focalized, focalizing. 1. to bring or come to a focus. 2. to localize. /ˈfəʊkəˌlaɪz/ verb 1. a less common word for focus