English translation: enterprise critical applications
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operationally critical applications, or operation-critical applications
Explanation: I have encountered this term in management strategy and similar documents. The context has usually been the deployment of a strategy, procedure or IT element that is critical to the core processes of the business. Whenever I have translated it in this sense it has fitted the context perfectly and been well received.
I can find no references to this term in general dictionaries such as the Grote Van Dale. I'm not aware of any electronic or otherwise management terminology dictionaries.