Definition of sine qua non
- reliability is a sine qua non for success
Patience is a sine qua non for this job.
an extensive grounding in mathematics is a sine qua non for a career in architecture
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Sine qua non can be translated literally as "Without which, not". Though this may sound like gibberish, it means more or less "Without (something), (something else) won't be possible". Sine qua non sounds slightly literary, and it shouldn't be used just anywhere. But it actually shows up in many contexts, including business ("A solid customer base is the sine qua non to success"), show business ("A good agent is a sine qua non for an actor's career"), and politics ("His support was really the sine qua non for her candidacy").
: something that is absolutely needed
What made you want to look up sine qua non? Please tell us where you read or heard it (including the quote, if possible).
investment of mental or emotional energy
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