During the later part of the 19th century, it was believed that a sound of change affected the whole of a language simultaneously: one sound system would smoothly develop into the next, and all words which contained a particular sound would be affected in the same way.

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Quote text and notes from Wikiquote: David Crystal (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.