"Historical linguistics, also termed diachronic linguistics, is the scientific study of language change over time. Principal concerns of historical linguistics include:
Historical linguistics is founded on the Uniformitarian Principle, which is defined by linguist Donald Ringe as:
Unless we can demonstrate significant changes in the conditions of language acquisition and use between some time in the unobservable past and the present, we must assume that the same types and distributions of structures, variation, changes, etc. existed at that time in the past as in the present." - (en.wikipedia.org 31.07.2021)
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