Middle High German is a historical stage of development during the High Middle Ages (ca. 1100-1400) of those central and southern dialects of German that participated in the Second or High German Consonant Shift and which later came to form the basis of Modern Standard German. The period is demarcated at the beginning by the gradual loss of full final vowels in morphological endings in its ancestor language Old High German and at the end by its further gradual development into early Modern High German.
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