Meaning of “rigorous” in the English Dictionary

"rigorous" in American English

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us /ˈrɪɡ·ər·əs/

severe or difficult, esp. because at a high level:

rigorous standards of accuracy
The Manhattan district attorney’s office had a pretty rigorous training program.

(Definition of “rigorous” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"rigorous" in Business English

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uk /ˈrɪɡərəs/ us

detailed and careful:

I want rigorous financial analysis of the options.
The selection process is extremely rigorous.

strict or severe:

A rigorous monetary and fiscal policy should encourage efficiency.
Refrigeration of food, improved hygiene and rigorous standards in the food industry prevent gastro-intestinal infections.

(Definition of “rigorous” from the Cambridge Business English Dictionary © Cambridge University Press)