Meaning of “mission-critical” in the English Dictionary

business-english dictionary

"mission-critical" in Business English

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mission-criticaladjective

uk us also mission critical IT

extremely important or necessary for a company, activity, etc. to operate successfully:

A small business may store all its mission-critical data on one PC.
mission-critical applications/systems/software

(Definition of “mission-critical” from the Cambridge Business English Dictionary © Cambridge University Press)