Wandel
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In linguistics, the German word Wandel ("change, mutation") is used to designate a fronting of a vowel caused by assimilation to a following nasal or w. This is the same effect as umlaut, but the cause is different.
Wandel affects the whole of the present tense of certain Germanic strong verbs of class 2 and 3. For example, English help and bind belong to the same verb class. The difference in vowel is a vowel shift e>i before the n which does not occur before l.
Wandel should not be confused with the effect of umlaut on the 2nd and 3rd person singular forms of the present tense of German strong verbs like geben - gib; on this see the section on Germanic verbs in the article on Umlaut.
