Definition - A collective name for a set of similar dialects of a language that are found in a particular region.

For example, Mandarin Chinese is a topolect that includes the dialects of Beijing and Nanjing, and is distinct from Hakka, another topolect of Chinese.

Etymology -
The English word — which was coined from the Greek combining form topos, place + dialect - entered English as loan translation of the Mandarin fngyán, regional speech (from fng, place + yán, language).

Oxford English Dictionary -
There is no OED citation for the term.

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