Declension of the word "Wirksamkeit"
Singular and plural for Wirksamkeit,
f, female declension 
effectiveness, validity, efficacy
Popular German Verbs
bestimmen
gehören
opfern
bewirken
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sich horten
recht haben
leisten
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daran sein
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beben
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lesen
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sonnen
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töten
leiten
Angst haben
versetzen
German Verb Conjugation and Word Forms Online
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The service shows German verb conjugation in Präsens, Präteritum, Perfekt, Plusquamperfekt, Futur I, and Futur II, as well as Indikativ, Konjunktiv I/II, and Imperativ forms. It supports modal verbs, forms with auxiliary verbs, and the main declension patterns of nouns and adjectives.
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