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Drift (linguistics)
Two types of language change can be characterized as linguistic drift: a unidirectional short-term and cyclic long-term drift.
==Short-term unidirectional drift==
According to Sapir, drift is the unconscious change in natural language. He gives the example ''Whom did you see?'' which is grammatically correct but is generally replaced by ''Who did you see?'' Structural symmetry seems to have brought about the change: all other ''wh-'' words are monomorphic (consisting of only one morpheme). The drift of speech changes dialects and, in long terms, it generates new languages. Although it may appear these changes have no direction, in general they do. For example, in the English language, there was the Great Vowel Shift, a chain shift of long vowels first described and accounted for in terms of drift by Jespersen (1909–1949). Another example of drift is the tendency in English to eliminate the ''-er'' comparative formative and to replace it with the more analytic ''more''. Thus, we now regularly hear ''more kind'' and ''more happy'' instead of the prescriptive ''kinder'', ''happier''. In English, it may be the competition of the ''-er'' agentive suffix which has brought about this drift, i.e. the eventual loss of the Germanic comparative system in favor of the newer system calqued on French. Moreover, the structural asymmetry of the comparative formation may be a cause of this change.
The underlying cause of drift may be entropy: the amount of disorder (differences in probabilities) inherent in all linguistic systems.〔See early work of Bar-Hillel and Mandelbrot, as well as Zipf and Martinet.〕
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