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German word Rechnung comes from German -ung, German rechnen
-ung (German)
-ing; forms nouns from verbs, usually describing either an event in which an action is carried out, or the result of that action.
rechnen (German)
(with 'mit') to expect. To count, reckon, calculate, compute.
Rechnung (German)
A reckoning, calculation. Bill, restaurant bill. Invoice.