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From Middle Dutchaller-, alder-, the genitive plural of alle(“all”). The prefix thus literally translates to "of all", yielding adjectives such as allerergst (from ergst(“worst”)) which literally translates to "the worst of all". Words formed this way are thus originally univerbations, although they may not be recognized as such anymore in contemporary speech (and constructions such as het allerleukst can only exist in this form, and not in the uncombined form *het aller leukst, which is ungrammatical).